Question

the wavelength of sound waves in hydrogen gas corresponding to the lower limit of audibility is

Answer 1

your question is incomplete. A complete question is ----> What is the wavelength of sound waves in hydrogen gas corresponding to the lower limit of audibility ? If speed of sound in hydrogen gas is 1350m/s.

solution : we know, human can hear sound in the range of 20Hz - 20,000Hz

so, lower limit of audibility = 20Hz

hence, frequency of sound, f = 20Hz

and speed of sound in hydrogen gas, u = 1350 m/s

now, wavelength of sound wave in hydrogen gas = speed of sound in hydrogen gas/frequency

= 1350/20 = 67.5 m.