Considering Conservation of Momentum, the momentum 
before and after must remain the same:
so:
before:
so:
before:
Images at home that represent conduction convection and radiation
1 answer:
You might be interested in
The correct choice is
D. 22 Hz and 42 Hz.
In fact, the beat frequency is given by the difference between the frequencies of the two waves:
In this problem, the beat frequency is , therefore the only pair of frequencies that gives a difference equal to 20 Hz is
D. 22 Hz and 42 Hz.