Frequency Converter

Wavelength & Frequency Band Reference

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Frequently Asked Questions

How do I convert Hz to kHz?

To convert Hz to kHz, divide by 1,000. For example, 1,000 Hz = 1 kHz, 5,000 Hz = 5 kHz. To convert kHz to Hz, multiply by 1,000. This is because kilo means one thousand in the SI prefix system.

How do I convert MHz to GHz?

To convert MHz to GHz, divide by 1,000. For example, 1,000 MHz = 1 GHz, 2,400 MHz = 2.4 GHz. To convert GHz to MHz, multiply by 1,000. This conversion is commonly used when comparing processor speeds and radio frequencies.

How do I convert between frequency and wavelength?

The relationship is: wavelength = speed of light / frequency. For electromagnetic waves, lambda = c/f where c = 299,792,458 m/s. Higher frequency means shorter wavelength, and vice versa. For example, 100 MHz has a wavelength of approximately 3 meters.

What is the frequency range of human hearing?

The human ear can typically hear frequencies from 20 Hz (low bass) to 20,000 Hz (20 kHz) (high treble). This range decreases with age, especially at the high end. Most adults can hear up to about 15-17 kHz.

What is the difference between Hz and RPM?

Hz (hertz) measures cycles per second, while RPM (revolutions per minute) measures rotations per minute. To convert: RPM = Hz x 60, or Hz = RPM / 60. For example, 60 Hz = 3,600 RPM, which is the synchronous speed of a 2-pole AC motor.

What is the frequency of AC power in different countries?

Most countries use either 50 Hz or 60 Hz for AC power. North America (US, Canada, Mexico) uses 60 Hz at 120V. Europe, Asia (except Japan), Australia, and Africa use 50 Hz at 230V. Japan uses both 50 Hz (East) and 60 Hz (West).

What frequency is FM radio?

FM radio operates in the 88 to 108 MHz frequency band (in most countries). This is known as the VHF (Very High Frequency) band. FM stands for Frequency Modulation, which varies the carrier frequency to transmit audio information.

What frequency is AM radio?

AM radio operates in the 530 to 1710 kHz frequency band (in the US). This is the Medium Frequency (MF) band. AM stands for Amplitude Modulation, which varies the carrier amplitude to transmit audio. AM signals can travel long distances at night due to ionospheric reflection.

What is the difference between MHz and GHz?

1 GHz = 1,000 MHz. GHz (gigahertz) is used for higher frequencies like processor speeds (2-5 GHz), Wi-Fi (2.4, 5, 6 GHz), and 5G cellular (sub-6 GHz and mmWave). MHz is used for lower frequencies like radio broadcasts (88-108 MHz) and older processors.

What frequency does Wi-Fi use?

Wi-Fi uses several frequency bands: 2.4 GHz (better range, slower speeds), 5 GHz (shorter range, faster speeds), 6 GHz (Wi-Fi 6E/7, very fast, short range). Each band is divided into channels to prevent interference between nearby networks.

What is the frequency of visible light?

Visible light has frequencies from approximately 430 THz (red light) to 770 THz (violet light). These correspond to wavelengths from 700 nm (red) to 380 nm (violet). Light is an electromagnetic wave, so it follows the same c = f x lambda relationship.

What frequency do 5G networks use?

5G uses three frequency ranges: Low-band (Sub-1 GHz) for wide coverage at 30-100 Mbps. Mid-band (1-6 GHz, mainly 3.5 GHz) for balanced coverage and speed at 100-900 Mbps. High-band/mmWave (24-47 GHz) for ultra-fast speeds (1-10 Gbps) but very short range.

How do I calculate the period from frequency?

The period (T) is the inverse of frequency (f): T = 1/f. For example, 50 Hz has a period of 1/50 = 0.02 seconds (20 ms). 60 Hz has a period of 1/60 = 0.0167 seconds (16.67 ms). The period represents the time for one complete cycle.

What is the frequency of a microwave oven?

Microwave ovens operate at approximately 2.45 GHz (2,450 MHz). This frequency is absorbed by water molecules, causing them to vibrate and generate heat. The corresponding wavelength is about 12.2 cm.

What is the Nyquist frequency?

The Nyquist frequency is half the sampling rate of a discrete signal processing system. According to the Nyquist-Shannon sampling theorem, to accurately digitize a signal, the sampling rate must be at least twice the highest frequency component of the signal.

How do I convert kHz to MHz?

To convert kHz to MHz, divide by 1,000. For example, 1,000 kHz = 1 MHz, 550 kHz (AM radio) = 0.55 MHz. To convert MHz to kHz, multiply by 1,000. Remember: 1 MHz = 1,000 kHz = 1,000,000 Hz.

What is the clock speed of a processor?

Processor clock speed is measured in GHz (gigahertz) or MHz (megahertz) for older processors. Modern CPUs run at 2-5 GHz, meaning they execute billions of cycles per second. However, clock speed alone does not determine performance due to architectural differences.

What is the difference between 50 Hz and 60 Hz?

50 Hz (used in Europe, Asia, Africa) means the AC power alternates 50 times per second. 60 Hz (used in Americas, parts of Asia) alternates 60 times per second. Equipment designed for one frequency may overheat or malfunction when used on the other frequency.

What is the frequency of a quartz crystal?

Common quartz crystal frequencies include 32.768 kHz (real-time clocks), 4 MHz, 8 MHz, 10 MHz, 16 MHz, and 20 MHz (microcontroller clocks). The 32.768 kHz crystal is used in watches because 2^15 cycles per second gives precise 1-second timing.

What is THz used for?

Terahertz (THz) frequencies (10^12 Hz) are used in: terahertz imaging (security scanning), spectroscopy (material identification), astronomical observations, and research into future high-speed wireless communications (beyond 5G). They fall between microwave and infrared.

How do I convert RPM to Hz?

To convert RPM to Hz, divide by 60. For example, 3,000 RPM / 60 = 50 Hz. 3,600 RPM / 60 = 60 Hz. This is why AC motors run at speeds that are multiples of these frequencies, depending on the number of poles.

What is the frequency of Bluetooth?

Bluetooth operates in the 2.4 GHz ISM band (2.400-2.4835 GHz), the same as Wi-Fi. It uses frequency-hopping spread spectrum (FHSS) with 79 channels that change 1,600 times per second for Bluetooth Basic Rate/Enhanced Data Rate.

What is the resonant frequency?

Resonant frequency is the natural frequency at which a system oscillates with maximum amplitude when driven by an external force. For an LC circuit: f = 1 / (2 x pi x sqrt(LC)). For a pendulum: f = 1 / (2 x pi) x sqrt(g/L).

How does frequency affect radio wave propagation?

Lower frequencies (AM bands, 530-1710 kHz) diffract around obstacles and reflect off the ionosphere, traveling long distances. Higher frequencies (VHF/UHF, above 30 MHz) travel in straight lines (line-of-sight) and are absorbed by obstacles, limiting their range.

What is the frequency response of speakers?

Speaker frequency response typically ranges from 20 Hz to 20 kHz to cover the human hearing range. Subwoofers handle 20-200 Hz, woofers 40-500 Hz, midrange 500 Hz-5 kHz, and tweeters 2-20 kHz. Flat frequency response means the speaker reproduces all frequencies equally.

What frequency is GPS?

GPS (Global Positioning System) uses frequencies in the L-band: L1 at 1.57542 GHz, L2 at 1.22760 GHz, and L5 at 1.17645 GHz. These frequencies can penetrate clouds and light foliage but are blocked by solid structures like buildings and tunnels.

How do I measure frequency?

Frequency can be measured using: an oscilloscope (count cycles over time), a frequency counter (digital counter for periodic signals), a spectrum analyzer (for RF signals), or software-based tools using sound cards (for audio frequencies).

What is the frequency of ultrasonic sound?

Ultrasonic sound is above 20 kHz (the upper limit of human hearing). Common ultrasonic frequencies include 25 kHz (industrial cleaning), 40 kHz (car parking sensors), 50-100 kHz (medical imaging), and 1-10 MHz (medical ultrasound diagnostics).

What is the frequency of infrared light?

Infrared (IR) light has frequencies from about 300 GHz to 430 THz, corresponding to wavelengths from 1 mm to 700 nm. IR is used in remote controls (typically 38-56 kHz carrier frequency modulated onto IR light), thermal imaging, and fiber optic communications.

How does frequency relate to energy?

The energy of a photon is directly proportional to its frequency: E = h x f, where h is Planck's constant (6.626 x 10^-34 J-s). Higher frequency means higher energy. This is why UV light (higher frequency than visible) can cause sunburn, while radio waves (low frequency) are harmless.

What is the sampling frequency for audio CDs?

Audio CDs use a sampling frequency of 44.1 kHz (44,100 samples per second). According to the Nyquist theorem, this allows accurate reproduction of frequencies up to 22.05 kHz, which covers the entire human hearing range (20 Hz - 20 kHz).