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Author Question: During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash and the sound ... (Read 32 times)

mckennatimberlake

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on: Jul 28, 2018
During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash and the sound of the thunder. What is the approximate distance, in miles, from the observer to the lightning?

Question 2

A helium-neon laser emits red light having a wavelength of 6.4  107 m and a power of 0.5 mW. How many photons are emitted each second?
 a. 6.4  1038
  b. 1.6  1021
  c. 3.2  1025
  d. 2.6  1018
  e. 1.6  1015


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Juro

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

2 mi

Answer to Question 2

e


mckennatimberlake

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Reply 2 on: Jul 28, 2018
Gracias!

gcook

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Reply 3 on: Yesterday
Wow, this really help

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