The Answer is on the Picture
Madelyn placed an ice cube into a beaker on a hot plate. The ice cube changed from a solid to a liquid and then to a gas. During
2 answers:
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Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.
