Electromagnetic Wave Calculator

Electromagnetic waves — like light, radio waves, and microwaves — travel at speeds that link their wavelength, frequency, and velocity through the simple relationship v = fλ. The Electromagnetic Wave Calculator lets you solve for any one of these three properties: select what to calculate, choose your medium (vacuum, air, water, glass, or custom), then enter the two known values to get your result. Secondary outputs include all three wave properties plus the wave period.

m/s
Hz
m

Results

Result

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Wavelength

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Frequency

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Velocity

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Period

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Frequently Asked Questions

What is the relationship between frequency and wavelength?

Frequency and wavelength are inversely proportional. As frequency increases, wavelength decreases, and vice versa. This relationship is described by the equation λ = v/f, where v is the wave velocity.

What is wavelength measured in?

Wavelength is measured in units of distance, typically meters (m). For different types of waves, you might see nanometers (nm) for visible light, micrometers (μm) for infrared, or centimeters (cm) for microwaves.

How do you measure wavelength?

Wavelength is the distance between two identical points on a wave, such as from crest to crest or trough to trough. It can be measured directly using instruments or calculated using the formula λ = v/f when velocity and frequency are known.

How does light wavelength affect different mediums?

When light travels through different mediums, its velocity changes but frequency remains constant. This causes the wavelength to change according to the refractive index of the medium. Light travels slower in denser mediums like water or glass.

How do you calculate energy from wavelength?

For electromagnetic radiation, energy is related to wavelength by E = hc/λ, where h is Planck's constant (6.626 × 10⁻³⁴ J⋅s), c is the speed of light, and λ is wavelength. Shorter wavelengths correspond to higher energy.

What are typical wave speeds for different types of waves?

Light in vacuum travels at 299,792,458 m/s, light in air at about 299,700,000 m/s, light in water at 224,901,000 m/s, and sound in air at 20°C travels at 343 m/s. Radio waves travel at the speed of light in their respective mediums.