1.

Sound is produced by the vibration of objects. Sound is a longitudinal wave. Sound needs a material medium to travel.(i) What do C and R in the figure indicate?(ii) Find out the wavelength in the figure and write it down.(iii) What is the speed of the wave if its frequency is 92 Hz?

Answer»

(i) C for compressions and R for rarefactions. Wavelength of longitudinal wave The distance between corresponding points of two consecutive compressions or two consecutive rarefactions is the wavelength of the longitudinal wave.

(ii) Wavelength = 1 m

(iii) Velocity V = f λ = 92 × 1 = 92 m/s



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