Spectrum | MCQs

Explanation

When white light passes through a prism, it splits into 7 colors, forming a spectrum known as a rainbow:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

The separation of visible light into its different colours is known as dispersion.

Explanation

• When an object reflects all the component colors of light, it appears white.
• This is because the object is reflecting all the wavelengths of visible light, which are then perceived by our eyes as white.
• If an object absorbs all seven colors of light (i.e., all the wavelengths of visible light), it appears black.

Explanation

Explanation

• The color of a star is primarily determined by its surface temperature.
• Stars come in a range of colors, including red, orange, yellow, white, and blue, which are indicative of their surface temperatures.
• The hotter the star, the bluer it appears, while the cooler the star, the redder it appears.

Explanation

Electromagnetic waves are typically listed in order of increasing wavelength (or decreasing frequency) as follows:

• Gamma-rays (shortest wavelength, highest frequency)
• X-rays
• Microwaves (longer wavelength, lower frequency)

Explanation

The term "band" refers to the speed at which data travels along communication lines.

It is also known as bandwidth.

It measures the range of frequencies that a communication channel can transmit.

It indicating how quickly data can be transferred.

Explanation

A spectrum is a band of seven colors that appear when white light is passed through a prism or a similar device, separating the different wavelengths of light.

The seven colors of the spectrum, in order, are:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet