Light is composed of photons, so we could ask if the photon has mass. The answer is then definitely “no”: the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.

Alternative Titles: eV, electronvolt. Electron volt, unit of energy commonly used in atomic and nuclear physics, equal to the energy gained by an electron (a charged particle carrying unit electronic charge) when the electrical potential at the electron increases by one volt.

Light indeed carries energy via its momentum despite having no mass. In contrast, for a particle with no mass (m = 0), the general equation reduces down to E = pc. Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum.

Photons do not experience time. From the perspective of a photon, there is no such thing as time. It’s emitted, and might exist for hundreds of trillions of years, but for the photon, there’s zero time elapsed between when it’s emitted and when it’s absorbed again. It doesn’t experience distance either.

violet

Red

Violet

Radio waves have photons with the lowest energies. Microwaves have a little more energy than radio waves. Infrared has still more, followed by visible, ultraviolet, X-rays and gamma rays.

The energy of the photon depends on its frequency (how fast the electric field and magnetic field wiggle). The higher the frequency, the more energy the photon has. As the frequency of a photon goes up, the wavelength () goes down, and as the frequency goes down, the wavelength increases.

Hence, photon of violet light has higher energy than the photon of red light.

Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency around 430 terahertz, while blue’s frequency is closer to 750 terahertz. Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV.

Infrared waves are a portion of the light spectrum that follows red. They have longer wavelengths than visible light, ranging from 700 nanometers to one millimeter. This renders them invisible to humans in almost all conditions.

Gamma rays

When it comes to visible light, the highest frequency color, which is violet, also has the most energy. The lowest frequency of visible light, which is red, has the least energy.

Ultraviolet (UV) (Wavelength 10-7 – 10-8 meters) UV-C rays are the most harmful and are almost completely absorbed by our atmosphere.

30-300 MHz

gamma rays

Most mobile operators use from radiofrequency waves in the range up 300 MHz to 3 GHz that can be harmful for human health (1).

The important parts of the human body vibration frequency are generally located in about 3 Hz–17 Hz. According to the International Standard ISO 2631 in the vertical vibration of the human body, the sensitive range is located in 6 Hz–8 Hz.

Binaural beats in the delta (1 to 4 Hz) range have been associated with deep sleep and relaxation. Binaural beats in the theta (4 to 8 Hz) range are linked to REM sleep, reduced anxiety, relaxation, as well as meditative and creative states.

However, a 2017 study that measured the effects of binaural beat therapy using EEG monitoring found that binaural beat therapy does not affect brain activity or emotional stimulation.

The decrease in latency, although not statistically significant and statistically significant increase in energy of alpha frequency indicates that 432 music Hz frequency music has some significant relaxing effect on the sleeping brain and equivocal effect upon the sleep latency, especially among the individuals with …

Context: The current reference frequency for tuning musical instruments is 440 Hz. Some theorists and musicians claim that the 432 Hz tuning has better effects on the human body, but there are no scientific studies that support this hypothesis.

Songs tuned to 440 Hz work on the third eye chakra (the “thinking”) while 432 Hz stimulates the heart chakra (the “feeling”). Therefore, 432 Hz music increases the spiritual development of the listener. It may even have healing properties.