Question

______ occurs when a bodys molecular wavelength sends vibrations to another body, resulting in the production of another sound wave.
resonance
focusing
refraction
interference
question 8 (5 points)
which of the following is an example of the doppler effect?
vibrations from a tuning fork pass through the air and cause a nearby dish of water to produce ripples of the same frequency.
two identical musical instruments being played next to each other will produce a sound twice as loud as if only one were played.
a hiker shouts \hello\ into a canyon and hears it repeated back several times before it fades away.
the siren of a police car sounds different when the car is coming toward you than it does when it passes you.

Explanation:

For the first question: Resonance is the phenomenon where one vibrating body transfers its vibrations to another body, causing it to vibrate at the same frequency and produce a sound wave. The other terms do not match this definition: focusing is concentrating waves, refraction is wave bending through a medium, and interference is overlapping of waves.
For Question 8: The Doppler effect describes the change in frequency of a wave as the source and observer move relative to each other. A police siren changing pitch as the car approaches and passes is a classic example. The other options describe resonance, constructive interference, and echo respectively.

Answer:

First question: Resonance
Question 8: The siren of a police car sounds different when the car is coming toward you than it does when it passes you.