Light Pretest

Front

What are infrared rays?

Back

Infrared rays are a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. They are commonly used in heat lamps and TV remote controls.

Front

Which electromagnetic waves carry the least energy?

Back

Microwaves carry the least energy among the options provided, as they have longer wavelengths compared to X-rays, visible light, and ultraviolet rays.

Front

What is light?

Back

Light is a form of energy that is visible to the human eye and is part of the electromagnetic spectrum.

Front

What is the relationship between wavelength, frequency, and energy?

Back

A wave with a large wavelength has a low frequency and low energy.

Front

What part of the electromagnetic spectrum can humans see?

Back

The only part of the electromagnetic spectrum that humans can see is visible light.

Front

Define electromagnetic spectrum.

Back

The electromagnetic spectrum is the range of all types of electromagnetic radiation, which includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the speed of light in a vacuum?

Back

The speed of light in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second).

Front

What is the difference between reflection and refraction of light?

Back

Reflection is the bouncing back of light when it hits a surface, while refraction is the bending of light as it passes from one medium to another.

Front

What is the role of prisms in light?

Back

Prisms can separate white light into its constituent colors (spectrum) through the process of refraction.

Front

What is visible light?

Back

Visible light is the portion of the electromagnetic spectrum that is visible to the human eye, typically ranging from wavelengths of about 400 to 700 nanometers.