Q18 of 20 Page 73

Represent graphically by two separate diagrams in each case

(i) Two sound waves having the same amplitude but different frequencies?


(ii) Two sound waves having the same frequency but different amplitudes.


(iii) Two sound waves having different amplitudes and also different wavelengths.

(i) Two sound waves having the same amplitude but different frequencies:


(ii) Two sound waves having the same frequency but different amplitude:



(iii) Two sound waves having different amplitudes and also different wavelengths:



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16

For hearing the loudest ticking sound heard by the ear, find the angle x in the Fig.12.4.

 17

Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?

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Establish the relationship between speed of sound, its wavelength and frequency. If velocity of sound in air is 340 m s-1, calculate

(i) Wavelength when frequency is 256 Hz.


(ii) Frequency when wavelength is 0.85 m.

 20

Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound. Mark the position of compression and rarefaction on this curve. Also define wavelengths and time-period using this curve.