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Author Question: A source of sound waves is placed at the center of a very large sound-reflecting wall. The source ... (Read 78 times)

imanialler

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on: Jul 28, 2018
A source of sound waves is placed at the center of a very large sound-reflecting wall. The source emits 0.500 W of power. Two meters from the source the intensity in W/m2 is
 a. 9.95  103.
  b. 1.99  102.
  c. 0.313.
  d. 0.399.
  e. 0.625.

Question 2

A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0 C. The speed of sound in sea water is 1 533 m/s. How much earlier (in s) does a dolphin 1 000 m from the source hear the sound than a person in a boat that is also 1 000 m distant? (Ignore the time it takes the sound to reach the water surface.)
 a. 0.652
  b. 2.12
  c. 2.24
  d. 2.77
  e. 2.90


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Kdiggy

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

b

Answer to Question 2

c


imanialler

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Reply 2 on: Jul 28, 2018
Gracias!

lcapri7

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Reply 3 on: Yesterday
Excellent

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