Which of the following equation represents a wave ?

From a wave equation

the frequency of the wave is

A pulse of a wave train travels along a stretched string and reaches the fixed end of the string.  It will be reflected back with

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

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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

Equations of two progressive waves are given by 

If amplitude and time period of resultant wave are same as that of both the waves, then 

Standing wavesare produced in a 10 m long stretched string.  If the string vibrates in 5 segments and the wave velocity is 20 m/s, the 5 segments and the wave velocity is 20 m/s, the frequency is

A standing wave is represented by y =a sin (100t ) cos (0.01)x, where y and a are in millimetre, t in seond and x is in metre.  Velocity of wave is

Two vibrating tuning forks produce progressive waves given by   

Number of beats produced per minute is