Waves questions | form four Physics

(2136) Question Category: Short answers

What are ultrasonic vibrations?

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(2137) Question Category: Short answers

An FM radio station broadcasts electromagnetic waves at a frequency of 125 MHz. The radio waves have a wavelength of 2.4 metres. calculate the speed of the radio waves.

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(2138) Question Category: Short answers

Gamma ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0	imes10^{21} Hz.
(i) What is the wavelength of these gamma rays?
(ii) What could be their period?

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(2139) Question Category: Short answers

Define an echo.

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(2140) Question Category: Short answers

Name any two factors that affect the speed of sound in air.

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