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An important news anouncement is transmitted by radio wavs to people who are 100 km away, sitting next to their radios, and by sound waves to people...

This question was answered on Mar 25, 2010. View the Answer
An important news anouncement is transmitted by radio wavs to people who are 100 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.0 m from the newscaster. Who receives the news first? Take he speed of sound in air to be 343 m/s.

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For radio.pdf

For radio:
Distance = 100 km = 10^5m
Speed of radio waves = 3* 10^8 m/s
Time taken = 10^5/(3*10^8) = 1/3000 s = 3.33 x 10 ^ -4 s
For announcement by newsroom:
D=3m
Speed of sound = 343 m/s
Time...

This question was asked on Mar 25, 2010 and answered on Mar 25, 2010.

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