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Waves
Waves

Beat Frequency

fbeat=∣f1−f2∣f_{beat} = |f_1 - f_2|

Frequency of amplitude modulation from two close frequencies.

Variables

f_beat
Beat frequency
Beats per second
Hz
f₁
Frequency 1
First frequency
Hz
f₂
Frequency 2
Second frequency
Hz

Derivation

From superposition of two waves.

Your notes

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Common questions

What is the Beat Frequency formula?

Beat Frequency is written fbₑₐₜ = |f₁ - f₂|. Frequency of amplitude modulation from two close frequencies. It belongs to Waves, under Sound Waves.

What are the units in fbₑₐₜ = |f₁ - f₂|?

In SI units, f_beat is beat frequency, measured in 1/s; f₁ is frequency 1, measured in 1/s; f₂ is frequency 2, measured in 1/s.

How is the Beat Frequency formula derived?

From superposition of two waves. The result is fbₑₐₜ = |f₁ - f₂|.