In a CD player, light from a laser diode enters a plastic disc and reflects from a layer of shiny aluminum. In the plastic, the laser light has a wavelength of A) greater than 780 nanometers B) 780 nanometers C) less than 780 meters D) 3x10⁸ m

Question

Quizplus · Accepted Answer

In a CD player, the laser diode typically emits light at a wavelength of 780 nanometers, which is in the infrared range. When the light enters the plastic of the CD, its wavelength does not change; it remains at 780 nanometers. The option suggesting a wavelength greater than 780 nanometers is incorrect in this context, and the notation in option D is not a standard way to represent wavelengths or any physical quantity. Therefore, the correct answer is that in the plastic, the laser light maintains its original wavelength of 780 nanometers.

In a CD Player, Light from a Laser Diode Enters