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Author Question: David stands 2.5 meters in front of a plane mirror. (a) How far from David is David's image in ... (Read 173 times)

Medesa

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on: Jul 29, 2018
David stands 2.5 meters in front of a plane mirror.
 
  (a) How far from David is David's image in the mirror?
  (b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?
  (c) If David is 180. cm tall, how tall is his image in the mirror?

Question 2

What is the momentum of a photon of light that has a frequency of 2.8  1014 Hz?
 
  A) 1.5  10-28 kgm/s
  B) 2.1  10-28 kgm/s
  C) 4.4  10-28 kgm/s
  D) 6.3  10-28 kgm/s
  E) 6.2  10-28 kgm/s


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leeeep

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Reply #1 on: Jul 29, 2018
Answer to Question 1

(a) 5.0 cm
(b) 3.0 m/s
(c) 180. cm

Answer to Question 2

E


Medesa

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Reply #2 on: Jul 29, 2018
TY


leeeep

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Reply #3 on: Jul 29, 2018
You're welcome


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