Question

1. The diagram below shows the range of wavelengths that make up each color of visible light. The wavelengths are shown in nanometers. There are one billion nanometers in one meter.
Which shade of visible light is caused by a light wave with the shortest wavelength?
A.orange
B.yellow
C.violet
D.red

2. The Sun mainly emits visible light, infrared light, and ultraviolet light. But the electromagnetic spectrum includes many more types of light.
Ultraviolet light has a longer wavelength than ______ but a shorter wavelength than ______
Blank one:
A. Infrared light
B. Microwaves
C. x-rays
D. Visible light
Blank two:
A. X-rays
B. Visible light

Answer 1

1) The color with shortest wavelength is violet

2) Ultraviolet light has a longer wavelength than C) x-rays but a shorter wavelength than D) visible light

Explanation:

1)

Electromagnetic waves consist of oscillations of the electric and the magnetic field in a plane perpendicular to the direction of motion the wave.

Electromagnetic waves are normally invisible to human eye, except for a small portion of the spectrum, called "visible part" or "visible light". The light having wavelengths ranging in this part of the spectrum is perceived by our eye as different colors, depending on its wavelength. In particular, the following colors are associated to the following wavelengths, as we can see from the picture:

• Violet: 380-450 nm
• Blue: 450-495 nm
• Green: 495-570 nm
• Yellow: 570-590 nm
• Orange: 590-620 nm
• Red: 620-750 nm

From this list, we can see therefore that the color with shortest wavelength is the violet.

2)

As we said previously, most of the electromagnetic waves are invisible to the human eye. In fact, electromagnetic waves are classified into 7 different types, according to their wavelength/frequency. From shortest to longest wavelength (and so, from highest to lowest frequency), we have:

Gamma rays  

X rays  $1nm-1pm$

Ultraviolet  $380 nm - 1 nm$

Visible light  $750 nm - 380 nm$

Infrared radiation  $25 \mu m - 750 \mu m$

Microwaves  $1 mm - 25 \mu m$

Radio waves  $> 1 mm$

Therefore, we can see that ultraviolet light has a longer wavelength than x-rays, but shorter wavelength than visible light.

Learn more about electromagnetic waves:

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