Question

81) The energy associated with a radiation
of wavelength 3000 Å is
1) 1.98 x 10-20 J 2) 6.626 x 10-19 J
3) 6.626 x 10-16 J 4) 3.14 Ⓡ 10-19 J​

Answer 1

Explanation:

Electromagnetic radiation of wavelength 3000Å is incident on an isolated platinum surface of work- function 6.30 eV. Due ot the radiation, the. observed.

Answer 2

Answer:

Option B

Explanation:

Energy of radiation in Joules is given as,

E = hc/λ

where, h = planck's constant (6.626 ×10^-34 J sec )

c = speed of light ( 3 × 10 ^8 ms-1)

λ = wavelength in metres ( 3000 × 10^-10 m)

E = 6.626 ×10^-34 J sec × 3 × 10 ^8 ms-1 ÷ ( 3000 × 10^-10 m)

E = 6.626 × 10 ^ -19 J

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