Some radio waves have a frequency of 4.8 × 10^9 Hz. Wave speed of electromagnetic waves = 3.0 × 10^8 m/s. Calculate the wavelength of the radio waves. Give your answer to 2 significant figures. Give the unit. * 4 points
Your answer
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Answer : The wavelength of the radio waves is

Explanation : Given,

Frequency =

Wave speed =

As we know that the speed of a wave is related to its frequency and wavelength.

Formula used:

where,

is the wave speed in metres per second, (m/s )

f is the frequency in hertz, (Hz )

is the wavelength in metres, (m)

Now putting all the given values in the above formula, we get:

Therefore, the wavelength of the radio waves is

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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