Questions in waves

Select	Question
	If fundamental frequency of closed pipe is $50 Hz$ then frequency of $2^{nd}$ overtone is
	Two open organ pipes of length 25 cm and 25.5 cm produce 10 beat/sec. The velocity of sound will be
	What is minimum length of a tube, open at both ends, that resonates with tuning fork of frequency 350 Hz ? [velocity of sound in air = 350 m/s]
	Two open organ pipes give 4 beats/sec when sounded together in their fundamental nodes. If the length of the pipe are 100 cm and 102.5 cm respectively, then the velocity of sound is :
	The harmonics which are present in a pipe open at one end are
	An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by 100 Hz, then the fundamental frequency of open pipe is:
	Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube A and B is
	If the temperature increases, then what happens to the frequency of the sound produced by the organ pipe
	Apparatus used to find out the velocity of sound in gas is
	Standing stationary waves can be obtained in an air column even if the interfering waves are