Calculate the mass of photon with wavelength 3.6 a


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Calculate the mass of photon of wave length of 3.6 A° ( calculate in SI unit )

Answered by admin @



λ = h / MV
M = h / λV
-----------------------------
------------------------------------------------
M --- mass of proton
h --- planck's constant
λ ---  Wave length
V --- Velocity
--------------------------------
--------------------------------------------------
λ = 3.6 A⁰ = 3.6 × 10⁻¹⁰ m
h = 6.626 
× 10 ⁻³⁴ 
V  =  3 × 10⁸ m/s 
---------------------------------
--------------------------------------------------
∴ M = ( 6.626 × 10 ⁻³⁴ ) / [ ( 3.6 × 10⁻¹⁰ ) × ( 3 × 10⁸)]

       = 6. 135 × 10⁻³³ kg //

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