Waves Test - 37...

A car blowing its horn at 480 Hz moves towards a high wall at a speed of 20 m/s. If the speed of sound is 340 m/s, the frequency of the reflected sound heard by the driver sitting in the car will be closest to ……..Hz.

A cylindrical tube open at both ends has a fundamental frequency f in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now………

A wave travelling along the x-axis is described by the equation y(x,t) = 0.005 Cos (ax - at). If the wavelength and the time period of the wave are 0.08 m and 2.0 s respectively, then a and a in appropriate units are ………

A wave travelling along a string is described by the equation y = A Sin (at – kx). The maximum particle velocity is ………..

A string is stretched between fixed points separated by 75 cm. It is observed to have a resonant frequencies of 420 Hz and 315 Hz. There are other resonant frequencies between these two. Then the lowest frequency for this string is ……..Hz.

Two tuning forks P and Q when set vibrating gives 4 beats/second. If the prong of fork P is filed, the beats are reduced to 2/s. What is the frequency of P, if that of Q is 250 Hz?

The length of a string tied across two rigid supports is 40 cm. The maximum wavelength of a stationary wave that can be produced in it is ………. cm.

A stationary wave of frequency 200 hz are formed in air. If the velocity of the wave is 360 m/s, the shortest distance between two antinodes is …….m

A tuning fork produces 8 beats per second with both 80 cm and 70 cm of stretched wire of a sonometer. Frequency of the fork is …….Hz.

Statement – 1: Two waves moving in a uniform string having uniform tension cannot have different velocities.
Statement – 2 : Elastic and inertial properties of string are same for all waves in same string. Moreover speed of wave in a string depends on its elastic and inertial properties only.