How many photons will a source of power ...

How many photons will a source of power 50W produce per second? The wavelength of an emitted photon is 6000 `Å` . Given , `h = 6.62xx10^(-34)J.s`

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`1.51 xx 10^(20)`

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How many photons of light with wavelength 400 nm can provide 1 J energy? [h=6.626xx10^(-34)J*s]

The voltage applied across the cathode and anode of an X-ray generating machine is 50,000 V. Determine the shortest wavelength of the X-ray emitted. Given h=6.62xx10^-34 js.

Work function of a metal is 2.3eV and on 1.0 cm^(2) area of that metal, a light of intensity 8.6 xx 10^(3) W.m^(-2) is incident. That intensity is distributed equally among the wavelength 4144 Å, 4972 Å and 6216 Å . If no ray is lost due to scattering and if each of the photons of proper energy can emit photoelectrons, what will be the number of photoelectrons emitted in 2 s? (h = 6.63 xx 10^(-34) J.s, 1eV = 1.6 xx 10^(-19)J)

Among the photoelectrons, emitted due to incidence of light of frequency f on a metal surface , only the electrons having the highest kinetic energy can ionise a hydrogen atom. If this experment is performed with light of frequency 5/6f , the photoelectron having the highest kinetic energy can excite a hydrogen atom and from this excited hydrogen atom a photon of wavelength 1215 Å is emitted . Determine the (ii) value of f. Given h=6.625 xx10^(-34)*s,c=3xx10^(8)*s^(-1), 1 eV=1.6 xx10^(-19)J , ionisation energy of hydrogen =13.62 eV.

Determine the de Broglie wavelength of an electron moving with velocity 10^(6) m.s^(-1) . What will be the de Broglie wavelength of a proton, moving with the same velocity? Given, Planck's constant = 6.62xx10^(-34) J.s , mass of electron = 9.1xx10^(-31) kg , mass of proton is 1840 times that of an electron.

What is the mass of a photon of sodium light with a wavelength of 5890 Å? [h = 6.626 xx 10^(-34) Js]

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