Question

Which of the following statements is/are correct
(i) The distance between two consecutive compressions is called frequency of sound wave
(ii) Sound propagates as pressure variations
(iii) Compressions are narrower in a high pitched sound

• A. (i) only
• B. (ii) only
• C. (iii) only
• D. (ii) and (iii)

Answer 1

The correct option is D (ii) and (iii)

Answer is D.

In longitudinal waves, the distance between two successive compressions is called its wavelength. wavelength affects the frequency of a wave.
Hence, the 1st statement is incorrect.
Sound is a sequence of waves of pressure which propagates through compressible media such as air or water.
Hence, the 2nd statement is correct.
The distance between the centers of two consecutive rarefaction and two consecutive compressions is called wavelength. Frequency is the number wavelengths per unit of time. Shoter the comporessions, more the frequency. More frequency means higher pitch.
Hence, the 3rd statement is correct.