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.
Answer: WAIT WHATTTT i have that same test due today and the answer is in explanation
Explanation:
Bike, truck train. we are in the same school i think. Its imma say the incisal JMES Im Lusi i used to help in the library
Kingdom Animalia includes only organisms that are heterotrophic.
Typically no. Displacement can be in multiple directions as a vector. of something is traveling only along x, then it would be true though this is usually not the case.
Conductors have many free electrons
insulators have few free electrons
conductors are ideal for electrical wiring
