Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 5 - Sound
Prev
a) Explain the terms ‘crests’ and ‘trough’ of a wave? What type of waves consists of crests and troughs?
b) The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man.
Answer:
a) The crest is a part of a transverse wave which is the elevation experienced by the wave from the line which is above zero disturbance. The trough is also a part of a transverse wave which is the depression experienced by the wave from the line which is below zero disturbance.
b) Speed of sound = 332 m/s
Time = 3s
Speed = distance/time
Distance = (Speed) (time) = 996 m
Video transcript
"hey guys welcome to lido q a video
i am vinit your lido tutor glad to bring
you this question on your
screen explain the terms
crest and trough of a wave
what type of wave consists of crests and
trough
okay so
crest and troughs
both are
parts of transverse wave
waves right
the crest is the elevation experienced
by the wave
the crest is the
elevation experienced by the wave
by the wave from the line which is above
zero disturbance from the line
above zero disturbance
and trough is
a part tough is the depression
depression experienced by
the way from the line which is below
zero disturbance
so trough
is the depression
experienced by the wave
by the wave
from the line
below zero disturbance
now let us look at part b
part b is the flash of a gun is seen by
a man in three seconds
before the sound is heard calculate the
distance of the gun
from the man so here
the speed of sound in air is
so speed we all know is 332
meter per second
time is 3 seconds
therefore distance is given by
speed into time
so this is equal to 332 into 3
that is equal to 996 meter
if you still have it out please leave a
comment below do like the video and
subscribe to our channel
i'll see you in our next video until
then bye guys
keep practicing"
Related Questions
Facebook
Whatsapp
Copy Link
Lido
Courses
Quick Links
Terms & Policies
Terms & Policies
Connect with us on social media!
2022 © Quality Tutorials Pvt Ltd All rights reserved