Consider  the  three  waves  z₁,z₂  and  z₃ as 

              z₁  =  Asian  

                   z₂  =  Asian  

                   z₃  =  Asian  

An  earthquake  generates  both  transverse  (S)  and  longitudinal  (P)  sound  waves  in  the  earth.  The  speed  of  S  waves  is  about  4.5 km  s ^-1  and  that  of  P  waves  is  about  8.0  km s ^-1.  A  seismograph  records  P  and  S  waves  from  an  earthquake.  The  first  P  wave  arrives  4.0  min  before  the  first  S  wave.  The  epicentre  of  the  earthquake  is  located  at  a  distance of

Two waves are said to be coherent, if they have

A whistle producing sound waves of frequencies,9,500 Hz and above is approaching a stationary person with speed u ms^-1. The velocity of sound in air is 300 ms^-1.If the person can hear frequencies upto a maximum of 10,000 Hz, the maximum value of u upto which he can hear the whistle is 

Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, path difference of 40 cm is equivalent to phase difference of 1.6π.  The frequency of this wave is

The equation of a wave on a string of liner mass density 0.04 kg^-1is given by

           .

The  second  overtone  of  an  open  pipe  has  the same  frequency  as  the  first  overtone  of  a closed  pipe  2 m  long.   The  length  of  the  open  pipe  is

The  phenomenon  by  which  stars  recede  from  each  other  is  explained  by

Speed  of  recession  of  galaxy  is  proportional  to  its  distance

Following  two  wave  trains  are  approaching  each  other  y₁  =  a  sin  200  t,  y_{2  =}  a sin  208 t.  The  number  of  beats  heard  per  second  is