If sound becomes louder which wave characteristic is likely increasing wavelengt

Question

If sound becomes louder which wave characteristic is likely increasing

wavelength

speed

frequncey

energy   

I put energy for this question and I got it wrong. I know the answer should be amplitude but that was not offered as a choice. So what would be the next best choice?

If sound becomes louder which wave characteristic is likely increasing

wavelength

speed

frequncey

energy   

I put energy for this question and I got it wrong. I know the answer should be amplitude but that was not offered as a choice. So what would be the next best choice?

Explanation / Answer

From my opinion, frequency is the next best option. Because the frequency stays the same but the amplitude of the sound pressure goes up. That makes your ear drums more.

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