The frequency of the wave is 132 Hz
Explanation:
To calculate the speed of the wave, we can use the following formula:

where
d is the distance travelled by the wave
t is the time elapsed
For the sound wave in this problem, we have:
d = 660 m is the distance travelled
t = 2 s is the time interval considered
Substituting and solving for v, we find the speed of the sound wave:

Now we can calculate the frequency of the wave by using the wave equation:

where
v = 330 m/s is the speed of the wave
is the wavelength
f is the frequency
Solving for f, we find:

Learn more about wavelength and frequency:
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I think that the answer is A
To keep the heat of the liquid from dispersing into the air around the cup.
Answer:
Yes, through erosion.
Explanation:
Water, wind, and ice shape earths surface. Water, wind, & ice move sediment to another area this process is called erosion.
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