A photon of blue light and a photon of red light are traveling in vacuum.The photon of blue light
A)has a smaller wavelength than a photon of red light and travels with the same speed.
B)has a smaller wavelength than a photon of red light and travels with a greater speed.
C)has a longer wavelength than a photon of red light and travels with the same speed.
D)has a longer wavelength than a photon of red light and travels with a greater speed.

Question

Quizplus · Accepted Answer

The wavelength of blue light is smaller than that of red light because blue light has a higher frequency. However, both photons travel at the same speed (since they are both traveling in a vacuum). Therefore, choice A is correct.

A Photon of Blue Light and a Photon of Red