The equation of a sound wave is given as y = 0.005 sin (62.4x + 316t). The wavelength of this wave 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 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:

A wave enters to water from air. In air frequency, wavelength, intensity and velocity are n₁, λ₁, l₁ and v₁ respectively. In water the corresponding quantities are n₂, λ₂, l₁and v₂ respectively, then:

A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a new frequency n+n1.Then n1 is equal to : ( the sound velocity in air is 300 m/s)

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)

The equation of a wave is given by

, where x and y are in metre and t in second, then velocity of wave is:

The driver of a car travelling with speed 30 ms-1 towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 ms^-1, the frequency of reflected sound as heard by driver is:

Two trains move towards each other with the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes times, then the speed of each train should be:

Equation of progressive wave is given by:

Then which of the following is correct?