A star  emitting radiation at a wavelength of 5000Å is approaching the earth with a velocity of 1.50 × 10⁶ m/s. The change in wavelength of the radiation as received on the earth is:

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same adn equal to 1 gm^-1. When both the strings vibrate simultaneously the number of beats 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:

The velocity of sound in any gas depends upon:

A cylindrical resonance tube open at both ends, has a fundamental frequency ƒ, in air. If half of the length is dipped vertically in water, the fundamental frequency of the air column will be:

A whistle revolves in a circle with angular velocity ω = 20 rad/s using a string of length 50 cm. If the actual frequency of sound from the whistle is 385 Hz, then minimum frequency heard by the observer far away from the centre will be:(velocity of sound v = 340 m/s)

Two waves are approaching each other with a velocity of 20 m/s and frequency n. The distance between two consecutive nodes is:

Two sound waves with wavelengths 5.0 m and 5.5 m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second:

Which of the following equation represents a wave?

An observer moves towards a stationary source of sound with a speed th of the speed of sound. The wavelength and frequency of the source emitted are λ and ƒ respectively. The apparent frequency and wavelength recorded by the observer are respectively will be: