Radio stations use electromagnetic waves for broadcasting. The chart shows different frequencies of waves used by radio stations
. Which radio station has the wave with the longest wavelength?
2 answers:
Answer: radio station W
Explanation:
The wavelength of a radio wave is given by:
where
c is the speed of light
f is the frequency of the wave
From the equation, we see that the wavelength is inversely proportional to the frequency: the higher the frequency, the shorter the wavelength, the lower the frequency, the longer the wavelength.
Therefore, the waves with longest wavelength are the waves with lower frequency: therefore, the waves emitted by radio station W.
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Answer:
Explanation:
This is a uniformly accelerated motion, so we can determine the deceleration of the car by using a suvat equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
s is the distance covered
For the car in this problem,
u = 27.8 m/s
v = 0
s = 17 m
Solving for a, we find the acceleration: