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Author Question: A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 ... (Read 137 times)

washai

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on: Jul 29, 2018
A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
 
  A) -6.0 cm
  B) -7.5 cm
  C) -13 cm
  D) +18 cm
  E) +6.0 cm

Question 2

An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626  10-34 J  s)
 
  A) 1.3  
  B) 2.9  
  C) 6.3  
  D) 1.4
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Kimmy

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

C

Answer to Question 2

A


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washai

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Reply #2 on: Jul 29, 2018
TY


Kimmy

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


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