A source of sound operates at 2.0 kHz, 20 W emitting sound uniformly in all direction. The speed of sound in air is `340 m s^(-1)` at a distance of air is `1.2kgm ^(-3)` (a) What is the intensity at a distance of 6.0 m from the source ? (b) What will be the pressure amplitude at this point ? (c ) What will be the displacement amplitude at this point ?

A source of sound operates at 2.0 kHz, 20 W emitting sound uniformly i

1.	A source of sound operates at 2.0 kHz, 20 W emitting sound uniformly in all direction. The speed of sound in air is `340 m s^(-1)` at a distance of air is `1.2kgm ^(-3)` (a) What is the intensity at a distance of 6.0 m from the source ? (b) What will be the pressure amplitude at this point ? (c ) What will be the displacement amplitude at this point ?
Answer» Correct Answer - A::B::C::D (a) Here given, `V_(air) = 340 m//s` power ` =(e )/(t) = 20 W` `f =2,000 Hz, p = 1.2 kg//m^3` So, intensity, `I = (e )/(t.A) = (20)/(4pir^2) = (20)/(4 xx pi xx 6^2)` ` = 44 mw//m^2 [because r = 8m]` (b) We know that, `I = (p_0^2)/(2p V_(air))` `rArr P_0 = sqrt(1 xx 2p V_(air))` `= sqrt(2xx 1.2 xx 340 xx 44 xx 10^(-3))` `=6.0 N//m^2` (c ) We know that, `I = 2pi^2 S_0^2 upsilon^2 P V` where `S_0` = displacement amplitude `rArr S_0 = sqrt((I)/(2pi^2 P^2 p V_(air))` Putting the value we get, `S_0 = 1.2 xx 10^(-6) m`

Discussion

No Comment Found

Related InterviewSolutions

Assume that the sun rotates about an axis through its centre and perpendicular to the plane of rotatin of the earth about the sun. The appearange of the sun, from any one pont on the earth, is shown. Light belonging to a particular spectral line, as received from the points `A, B, C` and `D` on the edge of the sun, are analyzedA. Light from all four points have the same wavelength.B. Light from `C` has greater wavelength than the light from `D`.C. Light from `D` has greater wavelength than the light from `C`.D. Light from `A` has the same wavelength as the lighht from `B`
A police car moving at `22 m//s`, chase a motoclist. The police man has horn at `176 H_(Z)`, While both of them move towards a stationary siran of frequency `165 H_(Z)`. Calulate the speed of the motorcyclist, if he does not observer any beats. (velocity of sound in air `= 330 m//s)` A. `33 m//s`B. `22 m//s`C. zeroD. `11 m//s`
When a stretched string of length `L` vibrating in a particular mode, the distance between two nodes on the string is `l`. The sound produced in this mode of vibration constitutes the `nth` overtone of the fundamental frequency of the string.A. `L=(n+1)l`B. `L-(n-1)l`C. `L=nl`D. `L=(n+1//2)l`
A cylindrical tube, open at both ends, has a fundamental frequency `f` in air . The tube is dipped vertically in water so that half of its length is in water. The fundamental frequency of the air column is now (a) `f // 2` (b) `3 f // 4` (C ) `f` (d) `2f`
A cylinderical tube open at both ends, has a fundamental frequency f in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of air column is nowA. `4F`B. `2F`C. `F`D. `F//2`
A source `S` and a detector `D` high frequency waves are a distance `d` apart on the ground. The direct wave from `S` is found to be in phase at `D` with the wave from `S` that is reflected from horizontal layer at an altitude `H`. The incident and reflected rayes make the same angle with the reflecting layer. When the layer rises a distance `h`, no signal is detected at `D` . Negle ct absorption in the atmosphere and find the relation between d,h, `H` and the wavelength `lambda` of the waves.
Two speakers `A` and `B`, placed `1m` apart, each produce sound waves of frequency `1800 Hz` in phase. A detector moving parallel to line of speakers distant `2.4 m` away detects a maximum intensity at `ɵ` and then at `P`. Speed of sound wave is A. `330 ms^(-1)`B. `360 ms^(-1)`C. `350 ms^(-1)`D. `340 ms^(-1)`
Two audio speakers are kept some distance apart and are driven by the same amplifier system. A person is sitting at a place 6.0 m from one of the speakers and 6.4 m from the other. If the sound signal is continuously varied from 500 Hz to 5000 Hz, what are the frequencies for which there is a destructive interference at the place of the listener? Speed of sound in air` = 320 ms^-1`
The first overtone of an open orgen pipe beats with the first ouertone of a closed orgen pipe with a beat frequency of `2.2 H_(Z)` . The fundamental frequency of the closed organ pipe is `110 H_(Z)` . Find the lengths of the pipes . Speed of sound in air `u = 330 m//s` .
A source of sound operates at 2.0 kHz, 20 W emitting sound uniformly in all direction. The speed of sound in air is `340 m s^(-1)` at a distance of air is `1.2kgm ^(-3)` (a) What is the intensity at a distance of 6.0 m from the source ? (b) What will be the pressure amplitude at this point ? (c ) What will be the displacement amplitude at this point ?

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment