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Physics 11

Chapter 8

Comprehensive Questions

Q 1 What is meant by wave motion? Define the terms wavelength and frequency and derive the relationship between them.
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Q 2 Describe longitudinal and transverse waves with examples and clearly explain the difference between them.
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Q 3 Explain the following terms:-
Crest Trough Compression Refraction Node Anti-node
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Q 4 What do you mean by stationary waves? Show that as the string vibrates in more and more loops, it frequency increases and wavelength decreases.
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Q 5 Explain Newton’s formula for the speed of sound. Show that how it was corrected by a French scientist Laplace?
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Q 6 Explain the speed of sound in a gas and give all the factors which affect the speed of sound in the air.
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Q 7 How the speed of sound varies in air with temperature and hence show that for each one degree centigrade rise in temperature the speed of sound increases by 0.61 ms-1.
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Q 8 What are beats? Explain how they are produced and show that the number of beats per second is equal to the difference in frequencies of the two sources.
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Q 9 What is Doppler’s Effect? Derive expression for the frequencies heard.
When the sounding source approaches the stationary listener. When listener moves towards a stationary sounding source.
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Q 10 What are organ pipes? Show that an open organ pipe is richer in harmonics than a closed organ pipe.
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Q 11 Explain the vibrations in a closed organ pipe and show that the frequency of third harmonic is .
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