NEET Physics Waves Questions Solved

Watch Physics > Waves Videos
play button
NEET - 2012

Two sources of sound placed close to each other, are emitting progressive waves given by

y1=4 sin 600πt and y2=5 sin 608 πt

An observer located near these two sources of sound will hear

(a)4 beats per second with intensity ratio 25:16 between waxing and waning

(b) 8 beats per second with intensity ratio 25:16 between waxing and waning

(c) 8 beats per second with intensity ratio 81:1 between waxing and waning

(d) 4 beats per second with intensity ratio 81:1 waxing and waning

Given, y1=4 sin 600πt

and y2=5 sin 608πt

Comparing with general equation

y=a sin 2πft

we get, f1=300 Hz and f2=304 Hz

Number of beats =f2-f1=4s-1

ImaxImin=a1+a2a1-a22=4+54-52=811

Difficulty Level:

  • 32%
  • 20%
  • 15%
  • 35%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 17, 2019)