Answer
I could be wrong but I’m pretty sure it’s C
Explanation
Answer:
A.The objects must be different temperatures and they must be in contact.
Explanation:
Answer:
a one bucket with full of sand because of it's mass which plays role in momentum
Answer:
The answer(s) for this question are as followed: A, C, & D
Explanation:
I hope this helped, let me know if i missed any.
when observer and source moves relative to each other then the frequency received by the observer is different from the real frequency
This apparent change in frequency due to relative motion is known as Doppler's effect.
Here we know that

here we know that
= real frequency
v = speed of sound
= speed of observer
= speed of source
so this is known as Doppler's Effect