how many photons with wavelength 5000 angstroms are needed to produce an energy equal to 1 joule
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Given:
wavelength (λ)=5000Α°=5000x10⁻¹⁰m
energy=1 Joule
Number of photon=?
we know that ,
E=hv⇒hc/λ
where h is planks constant=6.6x10⁻³⁴Js
c=speed of light=3x10⁸m/s
by substituting we get,
E=6.6x10⁻³⁴x3x10⁸/5000x10⁻10
=6.6x3x10⁻¹⁶/5000
=39.6 x10⁻²¹J
number of photons that provide 1 joule of energy
=1/39.6 x10⁻²¹J
=0.02525x10²¹photons
2.525x10¹⁹phtotons
wavelength (λ)=5000Α°=5000x10⁻¹⁰m
energy=1 Joule
Number of photon=?
we know that ,
E=hv⇒hc/λ
where h is planks constant=6.6x10⁻³⁴Js
c=speed of light=3x10⁸m/s
by substituting we get,
E=6.6x10⁻³⁴x3x10⁸/5000x10⁻10
=6.6x3x10⁻¹⁶/5000
=39.6 x10⁻²¹J
number of photons that provide 1 joule of energy
=1/39.6 x10⁻²¹J
=0.02525x10²¹photons
2.525x10¹⁹phtotons
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