Which of the following statements about radio waves, infrared radiation, and XX-rays are correct? Choose all that apply.

a. They all have the same wavelength in vacuum.

b. They all have exactly the same speed as visible light in vacuum.

c. The short-wavelength X-rays travel faster through a vacuum than the long-wavelength radio waves.

d. They all have the same frequency in a vacuum.

b. They all have exactly the same speed as visible light in vacuum.

c. The short-wavelength X-rays travel faster through a vacuum than the long-wavelength radio waves.

Explanation:

Part (a) They all have the same wavelength in vacuum;

wrong: They are electromagnetic wave and requires no material medium for their propagation, they always have varying wavelength.

Part (b) They all have exactly the same speed as visible light in vacuum;

Correct: They travel with the speed of light which is 3 x 10⁸ m/s

Part (c) The short-wavelength X-rays travel faster through a vacuum than the long-wavelength radio waves.

Correct : velocity of the wave is the product of frequency and wavelength, due to high frequency of X-rays, it penetrate faster than radio wave in vacuum.

Part (d) They all have the same frequency in a vacuum.

wrong: they always have varying frequency in vacuum, with X - rays being the highest while radio waves are the least.