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
Physics Mcqs
Which one of following postulate is in accordance with the Rutherfords model ?
Which one 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
When we excite some atoms by heat collision or electrical discharge they will________________?
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
In obtaining an X-ray photograph of our hand we use the principle of______________?
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
Photon of highest frequency will be absorbed when transition takes place from_____________?
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
The radiations emitted form hydrogen filled discharge tube show____________?
The radiations emitted form hydrogen filled discharge tube show____________?
A. band spectrum
B. line spectrum
C. continuous spectrum
D. absorption spectrum
Total number of series in hydrogen spectrum is_____________?
Total number of series in hydrogen spectrum is_____________?
A. three
B. four
C. five
D. six
X-ray are________________?
X-ray are________________?
A. of unknown nature
B. high energy electrons
C. high energy photons
D. radio isotopes
Hydrogen atom does not emit X-rays because _________________?
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
Excited atoms return to their ground state in_______________?
Excited atoms return to their ground state in_______________?
A. 10-10s
B. 10-8s
C. 10-6s
D. 10-9s