A laser used for lunar range-finding shoots a laser pulse with E0�0 = 0.12 JJ of energy. The reflectors on the moon are 45cm×45cm45cm×45cm. If we assume that the laser beam energy is uniformly distributed – a rather poor assumption but adequate for making an estimate – how much laser-light energy hits the reflector?

A laser used for lunar range-finding shoots a laser pulse with E0�0 = 0.12 JJ of energy. The reflectors on the moon are 45cm×45cm45cm×45cm. If we assume that the laser beam energy is uniformly distributed – a rather poor assumption but adequate for making an estimate – how much laser-light energy hits the reflector?

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter5: Matter Waves

Section: Chapter Questions

Problem 4P

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Compton effect

The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible lights, the Compton effect is missing.

Recoil Velocity

The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.

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