The three other frequencies at which the spring will resonate are 120 Hz, 180 Hz, 300 Hz.
Given that,
Frequency of fourth harmonic is 240 Hz.
Lets take fundamental frequency = f₁
4 f₁ = 240
f₁ = 240/4 Hz
f₁ = 60 Hz
Frequency of second harmonic = f₂
f₂ = 2 f₁
f₂ = 2 x 60 = 120 Hz
Frequency of third harmonic = f₃
f₃ = 3 f₁ = 3 x 60 = 180 Hz
Frequency of fifth harmonic = f₅
f₅= 5 f₁= 5 x 60 = 300 Hz
Three other frequencies are as follows,
120 Hz, 180 Hz, 300 Hz
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