Answer:
3. x 10⁸m/s
Explanation:
Given parameters:
Frequency of wave = 7.8 x 10⁶Hz
Unknown:
Speed of the wave = ?
Solution:
All electromagnetic radiation has a speed of 3. x 10⁸m/s in free space.
No matter the frequency and wavelength, they all have the same speed which is the same as the speed of light.
The speed of electromagnetic wave that has a frequency of [tex]7.8 * 10^{6}[/tex] Hz is [tex]3 * 10^{8}[/tex] m/s.
Electromagnetic waves:
Higher-frequency electromagnetic waves have less energy. All electromagnetic waves travel across space at the speed of light which is [tex]3 * 10^{8}[/tex] m/s.
As we know that,
Speed=frequency x wavelength,
It follows that the wavelength will also not change. So the direction, speed, frequency and wavelength of any electromagnetic wave are constant and these properties will not change after emission from a source.
Thus, speed of an electromagnetic wave is fixed and does not change on varying frequencies which is [tex]3 * 10^{8}[/tex] m/s.
OR
The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source.
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