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CGP EDU Academic Team
Published on: August 13, 2026
Energy of an electron is given by E = –2.178 × 10 –18 J 
. Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be: (h = 6.62 × 10 –34 Js and c = 3.0 × 10 8 ms –1
Text Solution
Verified by ExpertsThe correct answer is:
A
Δ E = 2.178 × 10 –18 
= 
2.178 × 10 –18 
= 
∴ λ ≈ 1.214 × 10 –7 m
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