Electromagnetic Radiation

Front

What is electromagnetic radiation?

Back

Electromagnetic radiation is a form of energy that travels through space at the speed of light and includes a range of wavelengths and frequencies, such as 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 299,792,458 meters per second (or about 300,000 kilometers per second).

Front

What is the relationship between wavelength and frequency?

Back

Wavelength and frequency are inversely related; as the wavelength increases, the frequency decreases, and vice versa. This relationship is described by the equation: speed = wavelength × frequency.

Front

What is the unit of measurement for wavelength?

Back

The unit of measurement for wavelength is typically meters (m), but it can also be expressed in nanometers (nm) or micrometers (μm).

Front

What is frequency and how is it measured?

Back

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

Front

What is the electromagnetic spectrum?

Back

The electromagnetic spectrum is the range of all types of electromagnetic radiation, organized by wavelength and frequency, from radio waves to gamma rays.

Front

What happens to energy as wavelength decreases?

Back

As wavelength decreases, the energy of the electromagnetic radiation increases.

Front

What is reflection in the context of light?

Back

Reflection is the bouncing back of light when it hits a surface, allowing us to see objects.

Front

What is the relationship between energy and frequency?

Back

Energy is directly proportional to frequency; as frequency increases, energy also increases, described by the equation: energy = Planck's constant × frequency.

Front

What is Planck's constant?

Back

Planck's constant is a fundamental constant in quantum mechanics, approximately equal to 6.626 × 10^-34 Joule seconds (Js), and relates energy to frequency.