Question

The intensity of a wave is
a) proportional to square of the frequency
b) proportional to the velocity of wave
c) proportional to the density of the medium
d) proportional to the square of the distance of the source from the observer

• A. only d is true
• B. a and b are true
• C. a, b and c are true
• D. a, b, c and d are true

Answer 1

Answer: (C)

Intensity of wave is $I =2 \pi^{2} \mu vA ^{2} v ^{2}$
Where, $\mu$ is the density
$v$ is the frequency
$v$ is the velocity
$A$ is the amplitude
The equation indicates the denser the medium, the more intense the wave; the more frequently a wave vibrates the medium, the more intense the wave is; the faster the wave travels, the more quickly it transmits energy and greater the amplitude, more intense the wave.