Question

By tripling of the amplitude of a wave there will be ____.

• A. a nine-fold increase in the frequency of the wave
• B. a nine-fold increase in the amount of energy transported by the wave
• C. a nine-fold increase in the wavelength of the wave
• D. a three-fold increase in the amount of energy transported by the wave

Answer 1

The correct option is B

a nine-fold increase in the amount of energy transported by the wave

Since, energy transported by the wave in terms of an amplitude of the wave is given by, E α A²

So, when the amplitude becomes 3 times the original one, E becomes (3)² i.e. 9 fold.