The wavelength of visible light varies from 380 nm to 750 nm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 6.8e-07 m.

energy of photon=1.824ev

Explanation:

given wavelength of ligt=6.8×10⁻⁷m=6800A⁰

energy of photon(E)=hc/λ;

and for simplicity

E=12400/λ

where λ is aken in angstorm

and energy in ev

E=12400/6800ev

E=1.824ev=energy of photon

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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