Sound WavesHard
Question
As a wave propagates
Options
A.the wave intensity is decreased as the inverse of the distance from source for a spherical wave
B.the wave intensity remains constant for a plane wave
C.the wave intensity decreases as the inverse square of the distance from the source for a spherical wave
D.total intensity of the spherical wave over the spherical surface centred at the source remains constant at all times
Solution
For a plane wave internsity (energy crossing per unit area per unit time) is constant at all points.
But for a special wave, intensity at a distance r from a point source of pwoer P (energy transmitted per unit) is given by
I =
or I ∝ 
Note : For a line source I ∝
because, I ∝
But for a special wave, intensity at a distance r from a point source of pwoer P (energy transmitted per unit) is given by
I =
or I ∝ Note : For a line source I ∝
because, I ∝
Create a free account to view solution
View Solution FreeMore Sound Waves Questions
A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength 2π m and frequency...A boat at anchor is rocked by wave whose crests are 100m apart and velocity is 25 m/sec. The boat bounces up once in eve...A person hears a single-frequency sound from a speaker that emits sound uniformly in all directions. The person records ...A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of15 ms-1. Then, the...A particle of mass 50 g participates in two simple harmonic oscillations, simultaneously as given by x1 = 10(cm) cos[80&...