The electron of a hydrogen atom revolves round the proton in a circular nth orbit of radius rn=ε₀n²h²/(πme²) with a speed vn=e²/2ε₀nh. The current due to the cirulating charge is proportional to
Options
Which of the following transitions will have highest emission wavelength?
Options
(a) n=2 to n=1 (b) n=1 to n=2 (c) n=2 to n=5 (d) n=5 to n=2
Correct Answer:
n=5 to n=2
Explanation: […]
The wavelength of first line of Balmer series is 6563Å. The wavelength of first line of Lyman series will be
Options
(a) 1215.4Å (b) 2500Å (c) 7500Å (d) 600Å
Correct Answer:
1215.4Å
Explanation:
λ(ʟyman) […]
The ratio of longest wavelength corresponding to Lyman and Blamer series in hydrogen spectrum is
Options
(a) 3 / 23 (b) 7 / 29 (c) 9 / 13 (d) 5 / 27
Correct […]
When alpha particles captures and electron, then it becomes a
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(a) helium atom (b) hydrogen atom (c) helim ion (d) hydrogen ion
Correct Answer:
helim ion
Explanation:
No explanation available. Be the […]
The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
Options
(a) 11.2×10⁻¹⁷ J (b) 12.9×10⁻¹⁶ J (c) 1.7×10⁻¹⁵ J (d) 10×10⁻¹⁶ J
Correct Answer:
12.9×10⁻¹⁶ […]
One milligram of matter on convertion into energy will give
Options
(a) 9×10⁵ J (b) 9×10¹⁰ J (c) 9×10³ J (d) 90 J
Correct Answer:
9×10¹⁰ J
Explanation:
No explanation available. Be the […]
The transition from the state 3n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from:
Options
(a) 2 […]
In nuclear fission, the percentage of mass converted into energy is about
Options
(a) 10% (b) 0.01% (c) 0.10% (d) 1%
Correct Answer:
0.10%
Explanation:
No explanation available. Be the first to write […]
In Bohr model of hydrogen atom, the force on the electron depends on the principal quantum number (n) as
Options
(a) independent of n (b) F∞1/n⁵ (c) F∞1/n⁴ (d) F∞1/n³
Correct Answer:
F∞1/n⁴
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