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What do you understand by reflection of light? Draw a diagram to illustrate reflection at a plane surface:

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Why ultrasound is useful in medical field.

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Will two separate 50 dB sounds together constitute a 100 dB sound? Explain.

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Is there any difference between echo and reflection of sound? Explain.

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Two people are listening to the same music at the same distance.

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A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?

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Why must the volume of a stereo in a room with wall-to-wall carpet be turned higher than in a room with a wooden floor?

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You can listen to your friend round a corner, but you cannot watch him/her. Why?

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We can recognize persons speaking with the same loudness from their voice. How is this possible?

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Why two tin cans with a string stretched between them could .

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What would happen to the loudness of sound with increase in.its frequency?

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Which property of sound waves determines its (a) Ioudness (b) pitch?

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Why the voice of women is more shrill than that of men?

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Suppose you and your friend are on the moon. Can you be able to hear any sound produced by your friend?

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Why are sound waves called mechanical waves?

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Explain how sound is produced by a school bell?

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How are Cracks detected in the interior of moving parts of high speed heavy machines?

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How is depth of water measured by echo method?

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What are the uses of ultrasound in medicine?

asked Oct 17, 2017 in Physics by shamroz (41.5k points)

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What is ultrasound or ultrasonic?

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