Electromagnetic Spectrum

Front

What is the 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

Which type of electromagnetic radiation has the longest wavelength?

Back

Radio waves have the longest wavelength in the electromagnetic spectrum.

Front

What is the relationship between wavelength and frequency in electromagnetic waves?

Back

Wavelength and frequency are inversely related; as the wavelength increases, the frequency decreases.

Front

Why do some objects appear black?

Back

Some objects appear black because they absorb all wavelengths of visible light and do not reflect any.

Front

What type of waves do cell phones use for communication?

Back

Cell phones use radio waves for communication.

Front

Which waves are not part of the electromagnetic spectrum?

Back

Sound waves are not part of the electromagnetic spectrum.

Front

What is the frequency of a wave?

Back

Frequency is the number of waves that pass a point in one second, measured in Hertz (Hz).

Front

Which has a higher frequency: X-rays or visible light?

Back

X-rays have a higher frequency than visible light.

Front

What is the speed of electromagnetic waves in a vacuum?

Back

The speed of electromagnetic waves in a vacuum is approximately 299,792 kilometers per second (or about 300,000 km/s).

Front

What is visible light?

Back

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