An open-ended tube is 7.8 m long. What is the wavelength of a third harmonic standing wave?

1 Answer
Jane
Mar 16, 2018

#5.2m#

Explanation:

For an open ended tube,at both the ends antinodes are present,so for #1#st harmonic it's length #l# is equals to distance between two antinodes i.e #lambda/2# where, #lambda# is the wavelength.

So,for #3# rd harmonic #l=(3lambda)/2#

Or, #lambda =(2l)/3#

Given, #l=7.8m#

So,#lambda =(2×7.8)/3=5.2m#

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