Home
Class 9
PHYSICS
A boy claps his hands near a straight-hi...

A boy claps his hands near a straight-high hill and heard the echo after 5 second. If velocity of sound in air is 340 m/s the distance between the boy and the hill is ...... metre

Text Solution

Verified by Experts

850
Promotional Banner

Topper's Solved these Questions

  • SOUND

    KUMAR PRAKASHAN|Exercise QUESTIONS AND ANSWERS (Fill in the blanks by selecting the correct alternative from those given in the bracket:)|14 Videos

  • SOUND

    KUMAR PRAKASHAN|Exercise QUESTIONS AND ANSWERS (State whether the following statements are true or false:)|15 Videos

  • SOUND

    KUMAR PRAKASHAN|Exercise QUESTIONS AND ANSWERS (Choose the correct option from those given below cach question:)|30 Videos

  • QUESTION PAPER 03

    KUMAR PRAKASHAN|Exercise SECTION -D|3 Videos

  • WORK AND ENERGY

    KUMAR PRAKASHAN|Exercise QUESTION & ANSWER (ADDITIONAL NUMERICALS FOR PRACTICE)|50 Videos

Similar Questions

Explore conceptually related problems

If man were standing unsymmetrically between parallel cliffs, claps his hands and starts hearing a series of echoes at intervals of 1 s. If speed of sound in air is 340 ms-1, the distance between two cliffs would be ......

A thunder tap is heard 5.5 s after the lightening flash. The distance of the flash is (velocity of sound in air is 330 m/s) :-

A toy-car, blowing its horn, is moving with a steady speed of 5 m//s, away from a wall. An observer, towards whom the toy car is moving, is able to heat 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to :

A car moving on a straight path with a speed of 54 km/h, passes by a stationary listener, playing hrn with a frequency 500 Hz. If velocity of sound in air is 340 m/s, find out the differenfce in frequencies of sound of horn, heard by stationary listener when car approaches him and recedes from him.

A vibrating string of certain length l under a tension T resonates with a mode corresponding to the first overtone (third harmonic ) of an air column of length 75 cm inside a tube closed at one end. The string also generates 4 beats//s with a tuning fork of frequency n . Now when the tension of the string is slightly increased the number of beats reduces to 2 per second. Assuming the velocity of sound in air to 340 m//s , the frequency n the tuning fork in H_(Z) is (a) 344 (b) 336 (c ) 117.3 (d) 109.3

A string 25cm long and having a mass of 2.5 gm is under tension. A pipe closed at one end is 40cm long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, 8 beats per second are heard. It is observed that decreasing the tension in the string decreases beat frequency. If the speed of sound in air is 320m//s , find the tension in the string.

A man is standing on top of a building 100 m high. He throws two balls vertically, one at t = 0 and after a time interval (less than 2 seconds). The later ball is thrown at a velocity of half the first. The vertical gap between first and second ball is + 15 m at t = 2 s. The gap is found to remain constant. Calculate the velocity with which the balls were thrown and the exact time interval between their throw.

A circus wishes to develop a new clown act. Fig. (1) shows a diagram of the proposed setup. A clown will be shot out of a cannot with velocity v_(0) at a trajectory that makes an angle theta=45^(@) with the ground. At this angile, the clown will travell a maximum horizontal distance. The cannot will accelerate the clown by applying a constant force of 10, 000N over a very short time of 0.24s . The height above the ground at which the clown begins his trajectory is 10m . A large hoop is to be suspended from the celling by a massless cable at just the right place so that the clown will be able to dive through it when he reaches a maximum height above the ground. After passing through the hoop he will then continue on his trajectory until arriving at the safety net. Fig (2) shows a graph of the vertical component of the clown's velocity as a function of time between the cannon and the hoop. Since the velocity depends on the mass of the particular clown performing the act, the graph shows data for serveral different masses. If the mass of a clown doubles, his initial kinetic energy, mv_(0)^(2)//2 , will :-