Test: Reflection Of Sound
10 Questions MCQ Test Science Class 9 | Test: Reflection Of Sound
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The unit of quantity on which pitch of the sound depends is :
Pitch is that characteristic of sound that depends on the frequency received by a human ear, and as we know that SI unit of frequency is hertz therefore the unit of quantity on which the pitch of the sound depends is Hertz.
Stethoscope is a medical instrument used by doctors to listen to the sounds produced within the human body, mainly in the heart and lungs, it works on the principle of multiple reflections of sound.
How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22°C is 344 m/s.
To reflect sound waves from any surface, it should have dimensions
During reflection, sound waves obey the laws of reflections. To have an appreciable reflection of sound waves from any surface, it should have dimensions equal or larger than the wavelength of the sound waves failing on it. That us, a smaller object will not reflect the sound waves of larger wavelength.
We can hear the sound of the horn of an approaching car before the car reaches, because
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