Question

1] A sound wave travels at a speed of 339 m $s^{-1}$. If its wavelength is 1.5cm, what is the frequency of the wave? Will it be audible?

2] A SONAR device on a submarine sense out a single and receives an eco 5 SEC later. calculate the speed of sound in water if the distance of the object from the submarine is 3625m

3] a boat at anker is rocking by wave consecutive let 5 20m/s what is the frequency of rocking of the boat.

4] A source of wave produces 40 crest 5 and 40 through in 0.4 seconds find the frequncy of the wave.

5] A child hears an eco from a clip 4 seconds of the sound from a powerful cracker is produced how far away is the cli from the child give that thespeed of sound if 340m/s

6] A ship sends out ultrasound that returns from the sea depth and it detected after 4Seconds. If the speed of ultrasound through sea water is 1550m/s what is the distance of the sea wet from the

Answer 1

2] We know that an echo travels the distance b/w the source and the object for 2 times...

So, V = (2 × d)/t ( 'V' is velocity of the sound wave, d is the distance b/w source and object, 't' is the time taken )

Hence, V = (2 × 3625)/5

V = 7250/5 = 1450 m/s

Answer 2

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Question 1.

Wavelenth= 1.5cm

Velocity = 339m/s

Frequency = velocity / wavelength

=339/1.5

=226Hz

..........

Question 2.

Time= 5sec

Distance = 3625 m

Speed = 2D/T

= 2(3625)/5

= 1450m/s

....................

Question 3

Wavelength = 5m

Velocity = 20m/s

Frequency = velocity/wavelength

= 20/4

=5Hz

...................

Question 4.

Time period= 40/0.4

=0.01

Frequency = 1 / time period

= 1/0.01

=100Hz

.....................

Question 5.

Time = 4sec

Velocity = 340m/s

V=2D/T

340=2D/4

2D= 340*4

D= (340*4)/2

D = 680m

..............

Question 6.

Time = 4sec

Velocity = 1550m/s

2D=v*t

D=(1550*4)/2

D= 3100m

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