Question

An iron us dropped into a well sound of splash is heard after 4.23 second if the depth of the well is 78.4 m then find the speed of sound in air

Answer 1

If
t
1
is the time taken by iron block to reach bottom then
t
1
=
√
2
H
g

=
√
2
×
78.4
m
9.8
m
s
−
2

=
4
s
Time taken by sound to reach observer
=
4.23
s
−
4
s
=
0.23
s
Speed of sound
=
Distance
Time

=
78.4 m
0.23 s

=
340.87 m/s.