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Author Question: In order to keep its food hot, a restaurant will place it under which type of lamp? a. ultraviolet ... (Read 42 times)

vHAUNG6011

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on: Jul 28, 2018
In order to keep its food hot, a restaurant will place it under which type of lamp?
 a. ultraviolet
  c. infrared
  b. visible light
  d. X-ray

Question 2

A train station bell gives off a fundamental tone of 1000 Hz as the train approaches the station at a speed of 20.0 m/s. If the speed of sound in air is 335 m/s, what will be the apparent frequency of the bell to an observer riding the train?
 a. 1060 Hz
  c. 943 Hz
  b. 1070 Hz
  d. 940 Hz


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vickyvicksss

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

C

Answer to Question 2

A


vHAUNG6011

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Reply 2 on: Jul 28, 2018
Wow, this really help

nguyenhoanhat

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Reply 3 on: Yesterday
Gracias!

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