I took the test to find out it's not A or D so it's either B or C.
The correct answer to the question is: Lower frequency and equal speed
The velocity of electromagnetic wave, the frequency and the wavelength are related by the following equation:
Making frequency the subject of the expression, we have:
From equation 2, we can see that the frequency and wavelength are in inverse proportionality.
This simply means that a wave with a higher frequency will have a lower wavelength and a wave with a lower frequency will have a higher wavelength.
NOTE: The speed of electromagnetic magnetic wave is constant (i.e 3×10⁸ m/s)
With the above information, we conclude that an electromagnetic wave that has a higher wavelength will also have a lower frequency and equal speed
Learn more: https://brainly.com/question/14316836
