Textbook Exercise 1A #3

[105707059]

Here is the question:
Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning.
(a) The speed of the radiation decreases.

The answer is no, the speed of radiation does not decrease and I'm not sure why. What equation relates speed and EM radiation?

[Rhea Desai 1A]

The speed is always equal to c which is the speed of light (3.0 *10^8 m/s). This comes from the equation c= wavelength * frequency. If frequency decreases, wavelength increases, and c stays the same.

[Sarah Wang 1I]

Remember that the speed of EM radiation waves always travel at the same speed (3.00 * 10^8 m/s)!

[Hailey Sarmiento 3E]

The speed of radiation does not decrease as frequency decreases. By speed of radiation they really mean the speed of light, which is a constant equal to the product of frequency and wavelength. However, as frequency decreases, wavelength increases because they are proportional.

[Sabira Mohammed 3I]

Hi, The speed of radiation is basically the speed of light which always stays the same (since it's a constant). If frequency decreases, then wavelength increases.