1.

Closed at one end and open at the other end resonates with sound wav 138 Hz and also 165 Hz but not with any wave of frequency intermediate between these two The frequency of the fundamental note is: a) 30 Hz b)15Hz c) 60hz d)7.5 hz

Answer»

Correct option(b) 15 Hz

Explanation:

The multiple of fundamental frequency gives 135, 165 Hz 

Hence taking LEAST COMMON MULTIPLE OF 135, 165 

135 = 5 × 3 × 3 × 3 

165 = 5 × 3 × 11 

SO 15 is least common

HENCE 

15 Hz is the fundamental frequency



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