A  uniform  string  is  vibrating  with  a  fundamental  frequency  ' f '.  The  new  frequency,  if  radius  and  length  both  are  doubled,  would  be

The speed of sound in oxygen (O₂) at a certain temperature is 460 ms^-1.The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)

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

The  disc  of  a siren  containing  60  holes  rotates  at  a  constant  speed  of  360  rpm.  The  emitted  sound  is  in  unison  with  a  tuning  fork  of  frequency.  

When temperature increases, the frequency of a tuning fork

Equation of progressive wave is given by

Then which of the following is correct?

A siren  emitting  sound  of  frequency  800 Hz  is  going  away  from  a static listener  with a speed of 30 ms^-1.Frequency  of  the  sound  to  be  heard  by  the  listener  is  (Take  velocity  of  sound  as  330 ms^-1)

The  frequency  of  a simple  harmonic  wave  is  given  by   where x  and  y  are  in  meter  and  time  is  in  second.  The  period  of  the  wave  in  second  will  be

A 5.5 m length of string has a mass of 0.035 kg. If the tension in the string is 77 N, the speed of a wave on the string is

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