A 100 W sodium lamp radiates energy uniformly in all directions. The wavelength of the sodium light is 589 nm . What is the energy per photon in ( eV ) associated with the sodium light? [ h = 6 .63 × 10 -34 J s ]

Question

A 100 W sodium lamp radiates energy uniformly in all directions. The wavelength of the sodium light is 589 nm . What is the energy per photon in ( eV ) associated with the sodium light? [ h = 6 .63 × 10 -34 J s ], 2 .11, 1.22, 0.5, 3.21

MARKS App · Accepted Answer

Given, power of the lamp, P = 100 W The wavelength of the sodium light, λ = 5 8 9 nm = 589 × 10 − 9 m Planck constant h = 6 .63 × 10 -34 J s The energy of each photon E = hc λ = 6 . 6 3 × 1 0 - 3 4 × 3 × 1 0 8 5 8 9 × 1 0 - 9 ∵ c = 3 × 1 0 8 m s - 1 = 3 . 3 8 × 1 0 - 1 9 J = 3 . 3 8 × 1 0 - 1 9 1 . 6 × 1 0 - 1 9 eV = 2 .11 eV

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