Answer:
An underground cavern collapsed
Explanation:
I did research
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.
Answer:
OD. The cat has been injured when it landed on its wrist.
Explanation:
Answer:
B
Explanation:
I hope this helps!!! I am very sorry if it was wrong though!!!