Waves CBSE Questions & Answers

The frequency of vibrating string is 200 Hz. If the tension is doubled, the frequency will be approximately

in open end organ pipe

A man is watching two trains one leaving and other approaching with equal velocities of 4 m/s. If they sound their whistles each of natural frequency 240 Hz, the number of beats heard per sec by the man will be (velocity of sound in air 320 m/s)

Speed of sound in air is 350 m/s. An engine blows a whistle of frequency of 1200 Hz, it is approaching the observer with velocity 50 m/s. The apparent frequency as heard by the observer is

A motor cyclist moving at 30 km/hr blows a whistle of 476 Hz towards a cliff. If velocity of sound is 1220 km/hr, the apparent frequency of the echo heard by him is

Which one is not produced by sound waves in air?

The air column in a pipe which is closed at one end will be in resonance with a vibrating tuning fork at a frequency 250 Hz, if the length of the air column is

If velocity of sound in air is 350 m/s then the fundamental frequency of a open pipe of length 50 cm is

An observer is watching two vehicles of same velocity ( 4 m/s). The former is approaching towards the observer while the latter is receding. If the frequency of the siren of the vehicle is 240 Hz and velocity of sound in air is 320 m/s , then the beats produced is

Which waves are used in sonography?

The speed of sound in air is 333 m/s. The fundamental frequency of the open pipe is 333 Hz. The second overtone of the open organ pipe can be produced with a pipe of length

A tuning fork when sounded along with a standard source of frequency 300 Hz produces 5 beat /s. The tuning fork when loaded by some wax is again found to give 5 beats/s with the standard source. The frequency of the fork originally was

If an open organ pipe is sounded with a tuning fork having frequency 256 Hz resonance occurs at 35 cm and 105 cm, the velocity of sound is

Stationary waves of frequency 300 Hz are formed in a medium in which the velocity of sound is 1200 metre/second. The distance between a node and the neighboring antinodes is

A stretched string resonates with tuning fork frequency 512 Hz when length of the string is 0.5 m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be