At one time, the metre was defined as 1650763.73 wavelengths of the orange light emitted by a light source containing `Kr^(86)` atoms. What is the corresponding photon energy of this radiation?

What is the accuracy of the metre defined in terms of wavelength of light radiation ?

What is the energy of photon from a laser that emits light at 632.8 nm

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from the energy level with n=4 to the energy level with n=1 ?

A photon of light with wavelength 700 nm has energy E. A photon of light of what wavelength would correspond to energy 2E ?

What is the energy of a photon in eV corresponding to the vissible light of maximum wavelength?

A monochromatic source emits light of wavelength 550 nm is emitted by a source . Find the number of photons emitted by the source in 90 seconds if power of source is 60 W.

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589nm. (a) What is energy associated per photon with the sodium light? (b) At what rate are photons delivered to the sphere?

what is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n=4 to and energy level with n=2 ?

In a set of experiment on a hydrogen on a hypotherical one-electron atom, the wavelength of the photons emitted from transition ending in the ground state (n = 1) are shown in the energy level diagram lambda_(5 to 1) = 73.86 nm lambda_(4 to 1) = 75.63 nm lambda_(3 to 1) = 79.76 nm lambda_(2 to 1) = 94.54 nm If an electron made a transition from n = 4 to n = 2 level, the wavelength of the light that it would emit is nearly