Question

calculate mass of a photon with wavelength 3.6A.

Answer 1

As we know that,
λ = h/p

; h = plank's constant
= 6.626×10⁻³⁴ J-s
p = momentum of proton
= mass× velocity
=m×v
∴λ = h/mv
⇒m = h/λv
v= velocity of light or proton = 3×10⁸ m/s
λ = 3.6 Α° = 3.6×10⁻¹⁰ m

substituting the values
m= (6.626×10⁻³⁴)/(3.6×10⁻¹⁰×3×10⁸)

= 6.135× 10⁻³³ kg

Answer 2

HEY GENIUS
HERE IS YOUR ANSWER

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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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