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Can you hear the sound produced due to vibrations of a seconds pendulum? Give reasons.
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State the approximate speed of ultrasound in air.
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Explain how do bats locate the obstacles and prey in their way.
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State two applications of ultrasound.
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A man can hear the sound of frequency :
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The properties of ultrasound that make it useful are
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What do you understand by the term infrasonic vibrations?
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What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
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What do you understand by the term ultrasonic vibrations?
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Name three animals which can hear ultrasonic vibrations.
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How do bats locate their prey during a flight?
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What is Galton’s whistle? To what use is it put?
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State four practical uses of ultrasonic vibrations.
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The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
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An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
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Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
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Multiple choice Question. Select the correct option.
A graph is a straight line parallel to the time axis in a distance-time graph. From the graph, it implies:
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Multiple choice Question. Select the correct option.
The slope of displacement – time graph represents.
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