Search Results

16 results for “frequency”

Formulae (16)

TF-IDF Weight

w_{t,d} = tf_{t,d} \times \log\frac{N}{df_t}

Term importance: frequency in a document scaled by rarity across documents.

PhysicsBasic

Wave Speed

v = f\lambda

Speed of a wave from frequency and wavelength.

PhysicsAdvanced

Doppler Effect

f' = f\frac{v \pm v_o}{v \mp v_s}

Observed frequency shift due to relative motion.

PhysicsBasic

Frequency and Period

f = \frac{1}{T}

Frequency is the inverse of the period.

PhysicsIntermediate

Energy of a Photon

E = hf

Energy of a photon from its frequency.

Physics Laws & TheoremsAdvanced

Planck–Einstein Relation

E = hf

The energy of a photon is proportional to its frequency.

Optics & WavesBasic

Wave Speed

v = f\lambda

Speed of a wave from frequency and wavelength.

Optics & WavesBasic

Wave Period

T = \frac{1}{f}

Time for one complete oscillation.

Optics & WavesAdvanced

Doppler Effect (Sound)

f' = f\frac{v \pm v_o}{v \mp v_s}

Observed frequency shift from relative motion.

Electricity & MagnetismAdvanced

Cyclotron Frequency

f = \frac{qB}{2\pi m}

Rotation frequency of a charge in a magnetic field.

Electronics & CircuitsAdvanced

Resonant Frequency

f_0 = \frac{1}{2\pi\sqrt{LC}}

Frequency at which an LC circuit resonates.

Electronics & CircuitsAdvanced

Resonant Frequency

f_0 = \frac{1}{2\pi\sqrt{LC}}

Frequency where an LC circuit resonates.

Biology & Life SciencesBasic

Allele Frequency Sum

p + q = 1

The two allele frequencies must total 1.

Biology & Life SciencesAdvanced

Recombination Frequency

RF = \frac{\text{recombinants}}{\text{total offspring}} \times 100

Genetic map distance in centimorgans.

Biology & Life SciencesBasic

Allele Frequency

p + q = 1

Frequencies of two alleles sum to one.

Time & CalendarBasic

Period & Frequency

T = \dfrac{1}{f}

A repeating event's period is the reciprocal of its frequency.