A source of sound emits 200π W power which is uniformly distributed over a

Sail E0 Webinar

Question

A source of sound emits

200 π

W power which is uniformly distributed over a sphere of radius

10 m

. What is the loudness of sound on the surface of the sphere?

Options:

A . 70 dB

B . 107 dB

C . 80 dB

D . 117 dB

Answer: Option D
:
D
Intensity,

I = \frac{P}{A} = \frac{200 π}{4 π \times (10)^{2}} = 0.5 W / m^{2}

Loudness =

10 l o g_{10} \frac{I}{I_{0}} = 10 l o g_{10} \frac{0.5}{10^{- 12}}

= 10 l o g_{10} (5 \times 10^{11})

= 10 l o g_{10} (\frac{10^{12}}{2})

= 117 dB

Was this answer helpful ?

Next Question

Submit Solution

More Questions on This Topic :

Question 1. 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 2. 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 3. 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 4. 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)

Question 5. A car emitting sound of frequency 500 Hz speeds towards a fixed wall at 4 m/s. An observer in the car hears both th....two sounds, the velocity of sound in air will be

Question 6. A whistle emitting a sound of frequency 440 Hz is tied to a string of 1.5 m length and rotated with an angular velocity....distance from the whistle will be (v = 330 m/s)

Question 7. A man standing on a platform hears the sound of frequency 605 Hz coming from 550 Hz train whistle moving towards th....sound is 330 m/s. What is the speed of train?

Question 8. A source of sound S is moving with a velocity 50 m/s towards a stationary observer. He measures the frequency of th....The velocity of the sound in the medium is 350 m/s.

Question 9. A band playing music at frequency f is moving towards a wall at a speed vb. A motorist is following the band with a spe....the expression for the beat frequency heard by the motorist is

Question 10. Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed....with speed u, the wavelength of reflected waves will be

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

GPOE / GPA Combined 1 Free Mock Test SAIL JO E-0 2024

Chapter 3.1 : INTRODUCTION Chapter 3 : Sinter Plant SAIL E0 - GPOE/GPA 2024

Chapter 2.3 : COAL HANDLING PLANT - Set 1 Chapter 2 : Coke Ovens and Coal Chemicals SAIL E0 - GPOE/GPA 2024

Chapter 1.1 : INTRODUCTION Chapter 1 : Raw Material Handling Plant SAIL E0 - GPOE/GPA 2024

DSP Combined 1 Free Revision Test SAIL JO E-0