what is the wavelength of the photon emitted by a lithium li2 ion when it under goes a transition

If infrared radiation is released by the Earth and there is an increased level of carbon dioxide in the atmosphere, then it is absorbed and heats the atmosphere (option A).

Greenhouse gases such as carbon dioxide and methane are well known to increase global warming because they trap the radiation that otherwise will be dissipated from the atmosphere to space.

Therefore, with this data, we can see that greenhouse gases are associated with global warming and it is the reason for which the dramatic increase in carbon dioxide levels may be dangerous.

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The composition of the sun by mass of hydrogen drops, but the amount of helium grows because helium is heavier than hydrogen.

The percentage by mass of an element in a compound is the percentage the mass of that element contributes to the total mass of the substance.

The percentage by mass of an element depends on the mass of the element.

Heavier elements in equal amounts with less dense elements have a greater percentage mass.

Since the mass of the helium atom is greater than the mass of the hydrogen atom, the Sun's composition by mass of hydrogen drops while that of helium increases.

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Answer:

5 m/s²

Explanation:

Acceleration = change in speed/time taken

20-5=15

15/3= 5 m/s²

\(\text{Density,}\\\\~~~~~~~~\rho = \dfrac mV\\\\\\\implies V = \dfrac m{\rho}\\\\\\\implies V = \dfrac{7 \times 10^{-3}~ \text{kg}}{\tfrac{5.6 \times 10^{-3}~ \text{kg}}{ 10^{-6} ~\text{m}^3} }\\\\ \\\implies V = \dfrac{7 \times 10^{-3}~ \text{kg}}{5.6 \times 10^{-3} \times 10^6~~ \text{kg}~ \text{m}^{-3}}\\\\\\ \implies V = 1.25 \times 10^{-6}~ \text m^3\\\\\\\implies V =0.00000125~ \text m^3\\\\\text{Hence the volume of the coin is 0.00000125}~ \text m^3\)

Electrical energy is transformed into thermal energy in the toaster     energy Q = 231 J

The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process. The increase in temperature caused by heating a substance causes these particles to accelerate and collide.

The energy that arises from a heated substance is referred to as thermal energy. The more the substance's thermal energy and the more its particles travel at higher temperatures.

Specific heat of copper C = 0.385 J/g°C

Mass m = 20 g

ΔT = (50 - 20)°C = 30 °C

Find:

Required energy Computation:

Q = mCΔT

Q = 20(0.385)(30)

Required energy Q = 231 J

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Answer:

F ΔT = Δ(M V)

Change in momentum is equal to applied force* time

Δ(M V) = 6 kg * 12 m / s = 72 kg-m / s

ΔT = 72 kg-m/s / 18 kg-m/s^2 = 6 s     after 6 sec it will tend to rebound

\(\boxed{\underline{\bf \: ANSWER}}\)

The current sensitivity of a galvanometer depends upon the following factors :-

___________

Hope it helps.

RainbowSalt2222

Answer:

The resultant velocity of the helicopter is \(\vec v_{H} = \left(89.894\,\frac{m}{s}, -93.348\,\frac{m}{s}\right)\).

Explanation:

Physically speaking, the resulting velocity of the helicopter (\(\vec v_{H}\)), measured in meters per second, is equal to the absolute velocity of the wind (\(\vec v_{W}\)), measured in meters per second, plus the velocity of the helicopter relative to wind (\(\vec v_{H/W}\)), also call velocity at still air, measured in meters per second. That is:

\(\vec v_{H} = \vec v_{W}+\vec v_{H/W}\) (1)

In addition, vectors in rectangular form are defined by the following expression:

\(\vec v = \|\vec v\| \cdot (\cos \alpha, \sin \alpha)\) (2)

Where:

\(\|\vec v\|\) - Magnitude, measured in meters per second.

\(\alpha\) - Direction angle, measured in sexagesimal degrees.

Then, (1) is expanded by applying (2):

\(\vec v_{H} = \|\vec v_{W}\| \cdot (\cos \alpha_{W},\sin \alpha_{W}) +\|\vec v_{H/W}\| \cdot (\cos \alpha_{H/W},\sin \alpha_{H/W})\) (3)

\(\vec v_{H} = \left(\|\vec v_{W}\|\cdot \cos \alpha_{W}+\|\vec v_{H/W}\|\cdot \cos \alpha_{H/W}, \|\vec v_{W}\|\cdot \sin \alpha_{W}+\|\vec v_{H/W}\|\cdot \sin \alpha_{H/W} \right)\)

If we know that \(\|\vec v_{W}\| = 25\,\frac{m}{s}\), \(\|\vec v_{H/W}\| = 125\,\frac{m}{s}\), \(\alpha_{W} = 240^{\circ}\) and \(\alpha_{H/W} = 325^{\circ}\), then the resulting velocity of the helicopter is:

\(\vec v_{H} = \left(\left(25\,\frac{m}{s} \right)\cdot \cos 240^{\circ}+\left(125\,\frac{m}{s} \right)\cdot \cos 325^{\circ}, \left(25\,\frac{m}{s} \right)\cdot \sin 240^{\circ}+\left(125\,\frac{m}{s} \right)\cdot \sin 325^{\circ}\right)\)\(\vec v_{H} = \left(89.894\,\frac{m}{s}, -93.348\,\frac{m}{s}\right)\)

The resultant velocity of the helicopter is \(\vec v_{H} = \left(89.894\,\frac{m}{s}, -93.348\,\frac{m}{s}\right)\).

To calculate the masses of stars in a binary system, we must measure their orbital characteristics.

Binary stars are two stars that are gravitationally bound to each other and orbit around a common center of mass.

The masses of the two stars in a binary system can be calculated by measuring their orbital characteristics, such as their orbital period (the time it takes for the stars to orbit each other), their orbital radius (the distance between the stars at their closest approach), and their orbital eccentricity (a measure of the deviation of the orbit from a perfect circle). By analyzing these characteristics, astronomers can use the laws of gravity to calculate the masses of the stars in the system.

Other techniques for measuring the masses of stars include observing the spectra of the stars (which can reveal their surface gravity and temperature), observing the motion of the stars (which can reveal their mass through their acceleration), and observing the stars' interaction with other objects (such as planets or disks of dust and gas).

\(\bold{ \: \purple{Hope \: This \: Helps \: You!}}\)

Answer:

B

Explanation:

Answer:

B

Explanation:

A momentum does not stop it is conserved

C momentum is a vector quantity while energy is a scalar there is a difference

D momentum can't be formed a new it is still conserved

The device that I have used in the past 24 hours is my smartphone.

(a) A smartphone is useful for communication, as it allows users to make phone calls and send text messages. It also has a variety of apps that can be used for tasks such as checking email, browsing the internet, and social media.

(b) Subsystems in a smartphone include the display, battery, central processing unit (CPU), memory, camera, and cellular network subsystem. The display subsystem is responsible for displaying visual information on the screen.

(c) These subsystems work together to allow the user to perform a wide range of tasks, from communication to entertainment and information access

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Define heat capacity of a substance:

Write the S.I unit of heat capacity:

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-,-

Answer:

It has 11 electrons 23_11=11

The pressure transmitted in the hydraulic system is 4.20 x 10^5 Pa or 4.15 atm.

The principle of Pascal's Law states that pressure applied to a fluid in a closed container is transmitted equally to every part of the fluid and the walls of the container.

The force applied to the master cylinder can be expressed as:

F = A * P

where

We know that the force applied to the brake pedal is 100 N, and the force exerted on the master cylinder is 500 N. Therefore, the force amplification factor is:

FA = F_slave / F_master = 500 N / 100 N = 5

We can use this factor to calculate the pressure in the system:

P_slave = P_master / FA

The area of the master cylinder can be calculated as:

A_master = pi * (d_master/2)^2 = pi * (0.55 cm / 100 cm/m)^2 = 2.38 x 10^-4 m^2

The area of each slave cylinder can be calculated as:

A_slave = pi * (d_slave/2)^2 = pi * (2.50 cm / 100 cm/m)^2 = 4.91 x 10^-3 m^2

The pressure in the master cylinder can be calculated as:

P_master = F_master / A_master = 500 N / 2.38 x 10^-4 m^2 = 2.10 x 10^6 Pa

The pressure in each slave cylinder can be calculated as:

P_slave = P_master / FA = 2.10 x 10^6 Pa / 5 = 4.20 x 10^5 Pa

Converting to atmospheres, we get:

P_slave = 4.20 x 10^5 Pa / 101325 Pa/atm = 4.15 atm

Therefore, the pressure transmitted in the hydraulic system is 4.20 x 10^5 Pa or 4.15 atm.

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Answer:

a) 16 N

b) 2.13 m/s²

Explanation:

Draw a free body diagram of the tv stand.  There are four forces:

Weight force mg pulling down,

Normal force N pushing up,

Friction force Nμ pushing left,

and applied force P pulling right.

Sum of forces in the y direction:

∑F = ma

N − mg = 0

N = mg

The net force in the x direction is:

∑F = P − Nμ

∑F = P − mgμ

∑F = 25 N − (7.5 kg) (10 m/s²) (0.12)

∑F = 16 N

Net force equals mass times acceleration:

∑F = ma

16 N = (7.5 kg) a

a = 2.13 m/s²

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Actually Welcome to the Concept of the FRICTION.

Force by Xavier = 25 N

Force of friction in the opposite direction of Xavier = f = umg

where, u = coefficient of kinetic friction.

so we here get as ,

Net force = 16 N

and acceleration = 2.13 m/s^2

What is the SI (metric) unit of FORCE?

with symbol ( N )

All the best !

Answer:

B, Newton,

Explanation:

B.  Newton defined as the Force which when applied to 1 Kg mass produces an acceleration of 1 m/s/s.

F = m * a.

The boat has traveled approximately 3,521,209 meters.

The initial velocity of the boat is 2.5 m/s, and it accelerates at a rate of 4.2 m/s² for 6.0 seconds.

We can use the following kinematic equation to calculate the displacement:

s = ut + (1/2)at²

Where:

s = displacement (unknown)

u = initial velocity = 2.5 m/s

t = time = 6.0 s

a = acceleration = 4.2 m/s²

Plugging in the values:

s = (2.5 m/s)(6.0 s) + (1/2)(4.2 m/s²)(6.0 s)²

s = 15 m + (1/2)(4.2 m/s²)(36 s²)

s = 15 m + (1/2)(4.2 m/s²)(1296 s²)

s = 15 m + 2.1 m/s² * 1296 s²

s = 15 m + 2.1 m/s² * 1679616 s²

s ≈ 15 m + 3521193.6 m

s ≈ 3521208.6 m

Rounding to the nearest whole number, the boat has traveled approximately 3,521,209 meters.

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The minimum speed an arrow must have to pass through the wheel without hitting any spokes is 1440 cm/s.

To shoot the arrow through the wheel without hitting any of the spokes, we need to determine the time available between the spokes and the required minimum speed of the arrow.

Calculate the angular speed of the wheel.
Angular speed (ω) = 2π × revolutions per second
ω = 2π × 3.0 rev/s = 6π rad/s

Calculate the time between spokes.
Since there are 8 spokes, each spoke takes up 1/8 of the total time to complete a full revolution.
Time between spokes (t) = 1/8 × time for one revolution
t = 1/8 × (1/3.0 s) = 1/24 s

Calculate the distance between spokes.
The arrow needs to travel through the distance between spokes in the given time. The distance is equal to the diameter of the circle created by the spinning spokes, which is twice the radius.
Distance between spokes (d) = 2 × radius
d = 2 × 30 cm = 60 cm

Calculate the minimum speed of the arrow.
The arrow needs to cover the distance between spokes within the time available.
Minimum speed (v) = distance / time
v = 60 cm / (1/24 s) = 60 cm × 24/1 s = 1440 cm/s

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The rare disorder that includes the inability to feel pain is called Congenital analgesia. That is option B.

Congenital analgesia is defined as ,the name implies, a genetic disorder that rarely occurs which makes one not to be able to feel pain.

It is an autosomal recessive disorder in which there is genetic changes in the PMRD12 gene.

Therefore, the rare disorder that includes the inability to feel pain is called Congenital analgesia.

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Every atom other than hydrogen and helium that we see around us is actually the result of nucleosynthesis, a process of nuclear fusion in stars that creates heavier elements.

During nucleosynthesis, two hydrogen atoms collide and form helium, which is then subjected to intense pressures and temperatures that allow the helium to fuse into heavier elements such as,

oxygen, nitrogen, and carbon. This process repeats until the heavier elements that form the core of stars, like iron and nickel, are created.

The process of fusion is ongoing and eventually the star runs out of fuel and explodes in a supernova, releasing the material that was created within it.

This material is then scattered across the universe, eventually forming clouds of gas and dust that coalesce to create planets, moons, and other bodies, including Earth.

All of the atoms that make up our planet, from oxygen to iron, are the direct result of this process, which began in the big bang and continues to the present day.

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Answer:

The effort required to perform work

Explanation:

Answer:

"element"= There are four basic sentence patterns based on sentence construction element

Answer:

1st one. Element

2nd one. Compound

Explanation:

Answer: Uh here

Explanation:

s=h=20

a=g=±10m/s=10m/s (since it is dropped)

v^2-u^2= 2as

v^2=2x10x20 (u=0; it is dropped not thrown)

v=20m/s

for calculating time

we know,

v=u+at

20= 0+ 10xt

t=2seconds

thus, it will attain a speed of 20m/s before touching the ground, but the time taken to reach the ground is 2seconds. Because the velocity is not uniform but acceleration/gravity is. If still there is any confusion. Try the same problem with 80 of height.

The physical pendulum consists of a meter stick that is pivoted at a small hole drilled through the stick a distance 0.056mfrom the 50 cm mark

The period of a physical pendulum is given by T = 2π √(L/g), where L is the length of the pendulum and g is the acceleration due to gravity. We can use this formula to find the distance d.

To find d, we use the formula:

T = 2π √(L/g)

Where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity.

We know that T = 2.5 s, g = 9.8 \(m/s^2\) and L is the distance from the pivot point to the center of gravity of the pendulum which is the 50 cm mark on the meter stick, so L = 0.5m.

We can rearrange the formula to solve for d :

d = L * √(\(T^2/4$\pi^2\) -1/g)

With the given values we can substitute in the formula

d = 0.5* √(\(2.5^2/4$\pi^2\) -1/9.8)

d = 0.056m

Therefore, The distance d from the 50cm mark is approximately 0.056m.

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Answer: (C)

Explanation:  (B) is the weight of the box acting downwards

(A) is the frictional force acting on the box because of moving forward against the plane

(D) is the force that moves the box forward

( C) is perpendicular to the box which means it is at 90 degrees with the box. Normal usually means at 90 degrees

To calculate the linear density, we need to wave divide the mass of the string by its length. The linear density of the string is 0.23 kg/m.

First, we need to convert the length from centimeters to meters. We know that 1 meter is equal to 100 centimeters, so we can divide the length by 100: 50.00 cm ÷ 100 = 0.50 m.

Convert the length of the string from centimeters to meters.
50.00 cm = 0.50 m (since 1 m = 100 cm)
Convert the weight of the string from grams to kilograms.
11.50 g = 0.0115 kg (since 1 kg = 1000 g)
Calculate the linear density by dividing the weight of the string by its length.
Linear density = Weight / Length = 0.0115 kg / 0.50 m = 0.023 kg/m.

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the radius and the circumference of the circle

After solving the equation: The circumference of the circle is 159.7 cm.

Circumference is the distance around the edge of a two-dimensional shape or a three-dimensional object such as a circle or sphere. It is calculated by multiplying the diameter of the circle or sphere by the number pi (π).

Radius: Let AB be the chord of the circle with centre O.
We are given that the length of perpendicular from the centre O to the chord AB is 9 cm.
Let r be the radius of the circle.
We know that the line segment joining the centre of a circle to any point on the circle is the radius.
Therefore, in triangle OAB,
r = 9 cm (given)
AB = 24 cm (given)
By using Pythagoras Theorem in triangle OAB, we get
r2 = (9 cm)2 + (24 cm)2
r2 = 81 + 576
r2 = 657
r = √657
r = 25.6 cm
Therefore, the radius of the circle is 25.6 cm.
Circumference:
We know that the circumference of a circle is given by the formula
Circumference = 2πr
Therefore, the circumference of the circle is
Circumference = 2π × 25.6 cm
Circumference = 159.7 cm

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A freely falling observer  is equivalent to an inertial observer who experiences no acceleration according to the equivalence principle (option B)

The equivalence principle establishes that the gravitational force encountered in a localized region is indistinguishable from the pseudo-force perceived by an observer situated within a non-inertial (accelerated) frame of reference.

Consequently, an observer in free fall within a gravitational field undergoes no discernible acceleration, mirroring the experience of an inertial observer.

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