The electric P.E of an electron in an orbit at a distance rn from the positive charge
A. Ke2/rn
B. Ke2/rn2
C. ÀKe2/rn
D. ÀKe2/rn2
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Physics
Ground state energy of the 4th orbit in a H-atom is
A. 13.60 eV
B. 3.40 eV
C. 0.85 eV
D. 1.51 eV
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Which of following postulate is in accordance with the Rutherfords model ?
A. continuous spectra for atoms
B. discrete spectra for atoms
C. either continuous nor discrete
D. no spectrum
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When we excite some atoms by heat collision or electrical discharge they will
A. radiate electromagnetic energy with a continuous distribution of wavelength
B. absorb particular wavelengths when white light is incident on them
C. radiate electromagnetic energy of discrete characteristic wavelength
D. emit either invisible or visible light
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In obtaining an X-ray photograph of our hand we use the principle of
A. photo electric effect
B. ionization
C. shadow photograph
D. any of above
In obtaining an X-ray photograph of our hand we use the principle of Read More »
Photon of highest frequency will be absorbed when transition takes place from
A. 1st to 5th orbit
B. 2nd to 5th orbit
C. 3rd to 5th orbit
D. 4th to 5th orbit
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The radiations emitted form hydrogen filled discharge tube show
A. band spectrum
B. line spectrum
C. continuous spectrum
D. absorption spectrum
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Total number of series in hydrogen spectrum is
A. three
B. four
C. five
D. six
Total number of series in hydrogen spectrum is Read More »
Hydrogen atom does not emit X-rays because
A. its energy levels are too close to each other
B. its energy levels are too far apart
C. it is too small in size
D. it has a single electron
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