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Author Question: A ruby laser beam (l = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, ... (Read 33 times)

D2AR0N

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on: Jul 28, 2018
A ruby laser beam (l = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
 a. 500 m
  b. 250 m
  c. 120 m
  d. 1.0 km
  e. 2.7 km

Question 2

Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total angular width (2q) of diffracted sound waves when the speed of sound in air is 340 m/sec.
 a. 167
  b. 83.6
  c. 19.5
  d. 41.8
  e. 0.11


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wuly

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Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


D2AR0N

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Reply 2 on: Jul 28, 2018
:D TYSM

frankwu0507

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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