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. See Answer Q 2 Describe longitudinal and transverse waves with examples and clearly explain the difference between them. See Answer Q 3 Explain the following terms:- Crest Trough Compression Refraction Node Anti-node See Answer 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. See Answer Q 5 Explain Newton’s formula for the speed of sound. Show that how it was corrected by a French scientist Laplace? See Answer Q 6 Explain the speed of sound in a gas and give all the factors which affect the speed of sound in the air. See Answer 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. See Answer 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. See Answer 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. See Answer Q 10 What are organ pipes? Show that an open organ pipe is richer in harmonics than a closed organ pipe. See Answer Q 11 Explain the vibrations in a closed organ pipe and show that the frequency of third harmonic is . See Answer

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