Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Question

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Answer 1

Question

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

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If a light beam carries momentum, should a person holding a flashlight feel a recoil analogous to the recoil of a rifle when it is fired? Why is this recoil not actually observed?

A small object at rest, absorbs a light pulse of power 20 mW and duration 300 ns. Assuming speed of light as 3 x 108 m/s. the momentum of the object becomes equal to (1) 0.5 10-17 kg m/s (2) 2 x 10-17 kg m/s (3) 3 x 10-17 kg m/s (4) 1 x 10-17 kg m/s

Answer 2

Question

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

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Answer 3

Question

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

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Answer 4

Question

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

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Answer 5

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

Answer 6

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

Answer 7

Chapter 23, Problem 1CQ

To determine

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Answer 8

Expert Solution & Answer

Answer to Problem 1CQ

The light from the flashlight produces recoil on the flashlight but the recoil force is relatively very low to recognize.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

The momentum of the light coming out of flashlight can be calculated using the equation p=E/c . The momentum calculated from the above equation have the value in the order of ∼10−5 . The momentum for a bullet coming out of a rifle can be calculated using the equation p=mv2/2c .

The momentum produced by the bullet while coming out of a rifle have in the range of ∼ kg . Thus, the recoil force produced by the light from flashlight is much smaller than the recoil force produced by the bullet from a rifle and this small recoil force on the flashlight is not noticeable.

Answer 12

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Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Concept explainers

Does the light from flashlight produces recoil on the flashlight and why it not recognizable.

Answer to Problem 1CQ

Explanation of Solution

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