Concept explainers
(a)
The angular speed of a laser beam due to diffraction and the diameter of this beam.
(a)
Answer to Problem 39P
The angular width is
The diameter is
Explanation of Solution
Given info: Wavelength of laser is
Diameter is
Formula used:
Where,
Where,
Calculation:
Find the angular half width of the beam from
So, the angular width is
The diameter of the beam when it reaches the satellite is
(b)
The diameter of beam if it struck the moon.
(b)
Answer to Problem 39P
The answer is
Explanation of Solution
Given info: Wavelength of laser is
Diameter is
Formula used:
Where,
Where,
Calculation:
Find the angular half width of the beam from
Hence, the angular width is
The diameter of the beam when it reaches the moon is
Chapter 28 Solutions
Physics: Principles with Applications
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