in resonance tube two successive positions of resonance are obtained at 15cm and 48cm if the frequency of the - Physics - Waves

Question

in resonance tube two successive positions of resonance are
obtained at 15cm and 48cm if the frequency of the fork is 500cps,
the velocity of sound is

Creative · Answer

given:
L1=15 cm
L2=48 cm
now
for a resonance tube
wavelength=2[L2-L1]
=2*33=66cm or 0 66 m
now velocity=frequency*wavelength
=500*0 66=330m/sec

in resonance tube two successive positions of resonance are obtained at 15cm and 48cm. if the frequency of the fork is 500cps, the velocity of sound is