Apiano emits frequencies the range from a low of about 28 hz to a high of about 4200 hz. find the range of wavelengths in air attained by this instrument when the speed of sound in air us 340 m/s.

V=wave velocity , f= frequency, λ=wavelength 
Use it to find corresponding wavelengths for f=28 Hz 
λ= v/f= 337/28=12.036 m 

for f=4200 Hz 
λ= v/f=337/4200= 0.08 m 
So max. wavelength is 12.036 m and 
Min Wavelength is 0.08 m 
So the range is between .08 m and 12.036 m
Hope this helps.