College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Nuclear-pumped x-ray lasers are seen as a possible
weapon to destroy ICBM booster rockets at ranges up to 2000 km. One limitation on such a device is the spreading of the beam due to
diffraction, with resulting dilution of beam intensity. Consider such
a laser operating at a wavelength of 1.40 nm. The element that
emits light is the end of a wire with diameter 0.200 mm.
(a) Calculate the diameter of the central beam at a target 2000 km
away from the beam source. (b) What is the ratio of the beam intensity
at the target to that at the end of the wire? (The laser is
fired from space, so neglect any atmospheric absorption.)
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