Answer: 1000 Hz
Explanation:
You can calculate frequency by dividing velocity by wavelength
Frequency = velocity/wavelength
Find velocity first.
900 m/3 s = 300 m/s
Plug values in to find frequency.
F = (300 m/s)/0.3 m
F = 1000 Hz
A) lighting an electric lamp as it becomes darker
B) not work ,because the water would freeze
Acceleration=(change in speed)/(time for the change). 43/0.28 = 153.6 m/s^2.
Distant objects in the universe moving away from Earth because the universe is expanding.
