Question

20
an em wave is found to have a frequency of 7.8 x 10^6 hz. what is the speed of the wave? * (0.5 points)
7.72 x 10^(-2) m/s
7.8 x 10^6 m/s
3.00 x 10^8 m/s
2.6 x 10^(-2) m/s
2.3 x 10^15 m/s

Explanation:

Step1: Recall EM - wave speed property

All electromagnetic waves travel at the speed of light in a vacuum, which is a constant value.
The speed of light $c = 3.00\times10^{8}\ m/s$. The speed of an EM - wave does not depend on its frequency.

Answer:

C. $3.00\times 10^{8}\ \frac{m}{s}$