GATE XE · 2018 · XE-C
Question 16: Properties and Applications of Materials
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Question 16
XE-CNAT2 marksNeeds review
The atoms in a gas laser have two energy levels such that a transition from the higher to the lower level releases a photon of wavelength 500 nm. If 7 × 10²⁰ atoms are pumped into the upper level with 4 × 10²⁰ atoms in the lower level, the amount of energy released in a single pulse is __________ Joules (give answer up to 2 decimal places)
(Given: Planck’s constant, h = 6.6 × 10⁻³⁴ J s; speed of light, c = 3 × 10⁸ m s⁻¹)
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2018XE-C
GATE XE 2018 · Paper 1
Engineering Sciences · Original paper archive
- Section
- Section XE-C
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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