Question

There are two types of LEDs (Light Emitting Diodes) that can produce yellow light. One manufacturer offers an LED that emits only yellow light of wavelength 590 nm. Another manufacturer offers a unit that is actually two LEDs, one that emits red light with a wavelength of 630 nm, the other emits green light with a 540 nm wavelength. The yellow light from both LEDs looks identical when shined on a wall.

Suppose that each type of LED was used to shine light through a diffraction grating. In each case, there will be a pattern that appears on the screen. Describe the differences (if any) between those patterns as completely as you can.

Answer 1

The light from the first LED will appear as yellow while the light from the second LED won't appear as Yellow light when passed through a diffraction grating

Step-by-step explanation:

There are two types of LED's

First LED emits only yellow light with wavelength of 590 nm

Second LED : emits red light with wavelength of 630 nm and emits green light with a 540 nm wavelength

The second LED produces a yellow light because of the mixture of red and green lights

therefore when the light from the SECOND LED is passed through a diffraction grating, the light is split into its components ( i,e green and red lights ) this is because the lights are not on the same wavelength