The frequency of the wave is 
Explanation:
The frequency, the wavelength and the speed of a wave are related by the following equation:

where
c is the speed of the wave
f is the frequency
is the wavelength
For the radio wave in this problem,


Therefore, the frequency is:

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To stop the car it would be 100m because if the car is going to 65km/h then it would still be 100km/h
Answer:
Surface area is the amount of space covering the outside of a three-dimensional shape.
I hope this help, if not I am sorry.
To calculate the mass of the fuel, we use the formula

Here, m is the mass of fuel, V is the volume of the fuel and its value is
and
is the density and its value of 0.821 g/mL.
Substituting these values in above relation, we get
Thus, the mass of the fuel 247 .94 kg.
Answer:
The number of complete vibration or wave made in
one second is called frequency.