Question

A marine biologist is studying dolphin calls and notices that sometimes the calls sound louder based on the background noise in the water. What wave property of the dolphin's call is changing because of the background noise?

1.Amplitude
2.Frequency
3.Speed
4.Wavelength

Answer 1

Option C, Speed

Step-by-step explanation:

Sounds travel faster in water. Their speed in water is five times of their speed in air.

With such high speed, sound waves instead of going through ossicles bones (in the inner ears) directly vibrate the heavy bone behind the ears. Due to this reason, a person below water hears sound waves of higher frequency.

However, while travelling through air sound waves reaches at lower frequency

Hence, option C is correct

Answer 2

The correct answer is option 1. "Amplitude".

Step-by-step explanation:

Waves of sound have different properties, among them amplitude is the one that determines the loudness or volume of the sound. The amplitude is the height of the wave, measured in meters, or in other word the maximum displacement of the sound's particle from its position of equilibrium. If a dolphin calling sounds louder because of the background noise, the waves of the sound that the dolphin produces would have a higher amplitude.