"Om Sai Ram "
SPECTRUM CLASSES
1. A person observes the smoke from a gun 1.4 sec before he hears the bang. If the gun is 476 m away from the person, find the speed of sound? Ans: the speed of sound = 476 1.4 = 340m/s
2. A person standing near the cliff fires the gun and heard the echo after 1.5 sec. If the speed of sound in air is 340m/sec, how far is person from the cliff?
3. A sound wave of frequency 5000 Hz travel in air with speed of 350m/sec. Calculate the wave length.
4. If you hear thunder 7sec after you see he lightening, how far you from the lighting
5. A bat emits ultrasonic wave of frequency 30 Khz..If its speed is 350m/s and bats hear its echo after 0.6 sec after emitting the , find how far is bat from obstacle .
6. Meera is standing between two hills. She shouted loudly and hears first echo after 0.5 sec and second echo after 1 sec. what is distance between two hills?
7. If 2000 ripples produced in 5 sec in a pond find time period and frequency of ripples formation.
8. A man standing in a valley between two parallel mountains fires a gun and hears echo at an interval of 2 s and 3.5 s. What is (a) The distance between two mountains (b) the location of the man with respect to the mountain?
9. Calculate the wavelength of a sound whose frequency is 220 Hz and speed is 440m/s in a given medium.
10. A body is vibrating 6000 times is 1 minute. If the velocity of sound in air is 360 m/s, find (i) Frequency in Hz ` ```(ii) wavelength of sound.
11. An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source? .
12. A stone is dropped from a 500 m tall building into a pond. When is sound splash heard? Given g =10 m/s2 , speed of sound = 340 m/s.
13. A source of wave produces 40 crests and 40 troughs in 0.4sec .Find the frequency of the wave. Ans : As one crest and one trough together make a wave produces 40 crests and 40 troughs is equal to 40 waves. So the source produces 40 waves per second so 40 Hz is the frequency.
14. Water wave enter a dock at a rate of 120 crests per minute. At the dock are 2 poles 12 m apart from each other. a worker watches a particular wave crest pass from one pole to another in 4s.what is the frequency of the wave? Ans: Frequency is the number of waves crossing a referring point, As Water wave enter a dock at a rate of 120 crests per minute f = 120/60 = 2 Water wave enter a dock at a rate of 120 crests per second. So the frequency is 2 Hz. 15. A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Er.Shyam Pachori
CL 157 D.D Nagar
Mob.: 9039803981
SPECTRUM CLASSES
1. A person observes the smoke from a gun 1.4 sec before he hears the bang. If the gun is 476 m away from the person, find the speed of sound? Ans: the speed of sound = 476 1.4 = 340m/s
2. A person standing near the cliff fires the gun and heard the echo after 1.5 sec. If the speed of sound in air is 340m/sec, how far is person from the cliff?
3. A sound wave of frequency 5000 Hz travel in air with speed of 350m/sec. Calculate the wave length.
4. If you hear thunder 7sec after you see he lightening, how far you from the lighting
5. A bat emits ultrasonic wave of frequency 30 Khz..If its speed is 350m/s and bats hear its echo after 0.6 sec after emitting the , find how far is bat from obstacle .
6. Meera is standing between two hills. She shouted loudly and hears first echo after 0.5 sec and second echo after 1 sec. what is distance between two hills?
7. If 2000 ripples produced in 5 sec in a pond find time period and frequency of ripples formation.
8. A man standing in a valley between two parallel mountains fires a gun and hears echo at an interval of 2 s and 3.5 s. What is (a) The distance between two mountains (b) the location of the man with respect to the mountain?
9. Calculate the wavelength of a sound whose frequency is 220 Hz and speed is 440m/s in a given medium.
10. A body is vibrating 6000 times is 1 minute. If the velocity of sound in air is 360 m/s, find (i) Frequency in Hz ` ```(ii) wavelength of sound.
11. An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source? .
12. A stone is dropped from a 500 m tall building into a pond. When is sound splash heard? Given g =10 m/s2 , speed of sound = 340 m/s.
13. A source of wave produces 40 crests and 40 troughs in 0.4sec .Find the frequency of the wave. Ans : As one crest and one trough together make a wave produces 40 crests and 40 troughs is equal to 40 waves. So the source produces 40 waves per second so 40 Hz is the frequency.
14. Water wave enter a dock at a rate of 120 crests per minute. At the dock are 2 poles 12 m apart from each other. a worker watches a particular wave crest pass from one pole to another in 4s.what is the frequency of the wave? Ans: Frequency is the number of waves crossing a referring point, As Water wave enter a dock at a rate of 120 crests per minute f = 120/60 = 2 Water wave enter a dock at a rate of 120 crests per second. So the frequency is 2 Hz. 15. A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Er.Shyam Pachori
CL 157 D.D Nagar
Mob.: 9039803981
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