a ringing mobile phone get slipped by hand of a boy standing at balcony at height 100m, the freq of sound heard by the person standing at balcony of height 55m from ground just before mobile phone passes him will be (actual frequency of ringing sound of mobile ia 200hz and velocity of sound is 330m/s)
Answers
Answered by
0
Given: Ball falling from height 100m. Person standing at height 55m. Actual frequency of phone ringing is 200 Hz and velocity of sound(v) is 330m/s.
To find: Frequency of sound heard by person just before mobile phone passes him
Explanation: Distance travelled by phone=100-55
= 45 m
Velocity (v1) of ball just before passing=
=
= 30 m/s
Using Doppler effect,
Apparent frequency when source travels=
=
= 330*200 / 300
= 220 Hz
Therefore the frequency of phone ringing heard by person is 220 Hz.
Similar questions
Math,
23 days ago
Math,
23 days ago
History,
1 month ago
Psychology,
1 month ago
Biology,
9 months ago
India Languages,
9 months ago
India Languages,
9 months ago