There is a simple relationship between the energy for a photon of light ephoton in units of ev (electron volts) and its wavelength λ in nm (nanometers) given by: ephoton (ev) = (1240 ev nm) / (λ nm). for example, if light has a wavelength of 620 nm, then its energy ephoton = (1240 ev nm) / (620 nm) = 2 ev. visible light has photon energies of ~1.7 to 3 ev and wavelengths of ~400 to 750 nm (λblue = 475 nm, λgreen = 510 nm, λyellow = 570 nm, and λred = 650 nm).

what is the wavelength λ in nm for light with a photon energy ephoton = 2 ev?

what is the photon energy for light with a wavelength λ = 630 nm?

in the electromagnetic spectrum, x-rays have much higher photon energies (~100 to 100,000 ev) and shorter wavelengths (~0.01 to 10 nm) than visible light. what is the photon energy for an x-ray with a wavelength λ = 6 nm?

is the photon energy of an x-ray

Explanation:

Given:

Energy of photon,

Then according to given:

is the wavelength

Again,

Energy of photon,

wavelength of the light,

Now, photon energy for an x-ray:

wavelength,

is the photon energy of an x-ray

spectral lines lyman is one set

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia