A source of sound is travelling with a velocity of 30 m/s towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 m/s in a direction at 60 ∘ with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 m/s) Options: A . &nbsp1011 Hz B . &nbsp1000 Hz C . &nbsp1094 Hz D . &nbsp1086 Hz

Answer: Option C : C f = ( v + v m v + v m − v s o u r c e ) 1000 = ( 340 + 20 c o s 60 ∘ 340 + 20 c o s 60 ∘ − 30 ) 1000 =1094 Hz

A source of sound is travelling with a velocity of 30 m/s towards a stationary o

Question

A source of sound is travelling with a velocity of 30 m/s towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 m/s in a direction at

60^{\circ}

with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 m/s)

Options:

A . 1011 Hz

B . 1000 Hz

C . 1094 Hz

D . 1086 Hz

Answer: Option C
:
C

f = (\frac{v + v_{m}}{v + v_{m} - v_{s o u r c e}}) 1000

= (\frac{340 + 20 c o s 60^{\circ}}{340 + 20 c o s 60^{\circ} - 30}) 1000

=1094 Hz

Was this answer helpful ?

Next Question

Submit Solution

More Questions on This Topic :

Question 1. Two sources A and B are sounding notes of frequency 680 Hz. A listener moves from A to B with a constant velocity u....value of u so that he hears 10 beats per second?

Question 2. The apparent frequency of the whistle of an engine changes in the ratio of 6:5 as the engine passes a stationary observe....is 330 m/s, then the velocity of the engine is

Question 3. Two sound sources are moving in opposite directions with velocities v1 and v2(v1>v2). Both are moving away ....of sound v = 300 m/s. Given that v1 and v2 ≪ v.

Question 4. A train has just completed a U-curve in a track which is a semi-circle. The engine is at the forward end of the semi-ci....train, when the speed of the train is 30 m/s, is

Question 5. Two factories are sounding their sirens at 800 Hz. A man goes from one factory to the other at a speed of 2 m/s. Th....of beats heard by the person in 1 s will be

Question 6. A source of sound emits 200π W power which is uniformly distributed over a sphere of radius 10 m. What ....the loudness of sound on the surface of the sphere?

Question 7. A source of sound produces waves of wavelength 60 cm when it is stationary. If the speed of sound in air is 320 m/s and ....wavelength of sound in the forward direction will be approximately:

Question 8. One train is approaching an observer at rest and another train is receding from him with the same velocity 4 m/s. B....observer is (speed of sound in air is 320 m/s)

Question 9. A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s. If they sound their whistle....sound in air is 320 m/s) will be equal to

Question 10. Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/h and 36 km/h. If second ....the roads, will be (velocity of sound is 330 m/s)

Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

DSP Combined 1 Free Revision Test SAIL JO E-0

GPOE / GPA Combined 1 Free Revision Test SAIL JO E-0

BSP Plant Specific Review Test SAIL JO E-0

BSL Combined 1 Free Revision Test SAIL JO E-0

GFM Combined 1 Free Revision Test SAIL JO E-0

Submit Solution

More Questions on This Topic :

Latest Videos

Latest Test Papers