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(a) State two differences between light waves and sound waves. (b) The waves of the same pitch have their amplitudes in the ratio 2 :3. 1. What will be the ratio of their loudness? 2. What will be the ratio of their frequencies? (c) Name the subjective property 1. on sound related to its frequency. 2. of light related to its wavelength |
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Answer» (a) The two main difference are : Light Waves: 1. They are electromagnetic waves and their velocity is 3 × 108ms-1. 2. They have very small wavelength. Sound Waves: 1. These are mechanical waves and their velocity is 340ms-1. 2. The wavelength of sound waves is quite large compared with that of light waves. (b) : 1. Since loudness is inversely proportional to the square of the amplitude, I = loudness ∝ 1/(amp)2 therefore loudness will be in ratio of (2)2 : (3)2 i.e., 4 : 9. 2. Since their pitch is the same, therefore their frequencies will be same i.e., their ratio is 1 : 1. (c) : 1. Loudness 2. Colour |
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