1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard X
Physics
Doppler Effect
Choose the co...
Question
Choose the correct option in which
there is NO perceived Doppler shift
between a source
and a detector of the sound .
A
The source travels toward the stationary detector
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
The detector travels toward the stationary source
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Both the source and the detector travel in the same direction
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Both the source and detector travel in opposite directions, with the source and detector moving away from each other
No worries! We‘ve got your back. Try BYJU‘S free classes today!
E
Both the source and detector travel in opposite directions, with the source and detector moving toward each other
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is
C
Both the source and the detector travel in the same direction
Doppler shifted frequency is given by
f
′
=
f
(
c
−
v
o
c
−
v
s
)
When
v
o
=
v
s
=
v
,
f
′
=
f
(
c
−
v
c
−
v
)
=
f
Thus there is no perceived Doppler shift when source and detector move in same direction with same speed.
Suggest Corrections
0
Similar questions
Q.
A source and a detector move away from each other, each with a speed of
10
ms
−
1
with respect to the ground, with no wind. If the detector detects a frequency
1950
Hz
of the sound coming from the source, what is the original frequency of the source ?
Speed of sound in air
=
340
ms
−
1
.
Q.
A straight line source of sound of length
10
m
emits pulse that travels radially outward from the source. A detector is located at a perpendicular distance of
7
m
from the source. The total power emitted by the source in the form of sound wave is
2.2
×
10
4
W
. If the surface area of the acoustic detector is
1.2
cm
2
, then the power (in
mW
) intercepted by the detector is
(Assume waves reaches surface of detector perpendicularly and take
π
=
22
7
)
Q.
A source of sound and a detector are moving along the same line with same speed :
Q.
A source of sound is moving along a circular orbit of radius 3m with an angular velocity of 10 rad/sec. A sound detector located far away from the source is executing S.H.M. along the line with an amplitude 1m. The freuency of oscillation of the detector is 5 per sec. The source is at the point A when the detector is at the point B. If the source emits a continuous sound wave of frequency 340 Hz, the minimum and maximum frequency recorded by the detector (velocity of sound in air = 330 m/s)
Q.
A source of sound emitting a 1200 Hz note travels along a straight line at a speed of 170 m s
−1
. A detector is placed at a distance 200 m from the line of motion of the source. (a) Find the frequency of sound receive by the detector at the instant when the source gets closest to it. (b) Find the distance between the source and the detector at the instant in detects the frequency 1200 Hz. Velocity of sound in air = 340 m s
−1
.