A dark colored rock composed of smaller pieces of irregularly shaped rock. Classify this rock by using the drop-down menus to de
scribe the size, shape, and pattern of its grains. Grain size: Grain shape: Grain pattern:
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.
