Advertisements
Advertisements
प्रश्न
Numerical problem.
A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard? (Given g = 10 m s–2 and speed of sound = 340 m s–1)
Advertisements
उत्तर
(Given g = 10 m s– 2 and speed of sound = 340 ms– 1)
Height = 750m
h = ut + 0.5 gt2
The initial velocity is 0
750 = 0.5 × 10 × t2
t = 10sec
Speed of sound is `(340"m")/"sec"`
So, time taken to travel 750m upwards is,
`750/340"` = 2.20s
time taken = 10 + 2.20 = 12.2 sec.
APPEARS IN
संबंधित प्रश्न
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s−2 and speed of sound = 340 m s−1.
During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why?
A boy fires a gun and another boy at a distance of 1020 m hears the sound of firing the gun 3 s after seeing its smoke. Find the speed of sound.
What name is given to those aircrafts which fly at speeds greater than the speed of sound?
When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be :
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is _____.
