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A. Rectilinear B. Curved C. Zigzag or erratic D. None of these Right Answer: C. Zigzag or erratic
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Pair production takes place in the vicinity of a heavy nucleus so that?
A. Net energy is conserved B. Net charge is conserved C. Net momentum is conserved D. All of the above Right Answer: C. Net momentum is conserved
Read More »Charge on an electron was determined by?
A. Ampere B. Maxwell C. Millikan D. Thomson Right Answer: C. Millikan
Read More »Radioactivity is a?
A. Spontaneous activity B. Chemical property C. Self disintegration property D. None of these Right Answer: C. Self disintegration property
Read More »Half life of radium is 1590 years. In how many years shall the earth loss all its radium due to radioactive decay?
A. 1590×106years B. 1590×1012years C. 1590×1024years D. Never Right Answer: D. Never
Read More »Curie is the unit of?
A. Half life B. Intensity C. Wavelength D. None of these Right Answer: B. Intensity
Read More »The velocity of laser light is?
A. Less than ordinary light B. More than ordinary light C. Equal to ordinary light D. Different for different colours of frequency Right Answer: C. Equal to ordinary light
Read More »The metastable state for an atom in laser light is?
A. 10-4sec B. 10-5sec C. 10-3sec D. 10-8sec Right Answer: C. 10-3sec
Read More »In normal state of energy, the incident high energy photons will be?
A. Stimulated B. Absorbed C. Cause X-ray emission D. Cause laser production Right Answer: B. Absorbed
Read More »What is the velocity of a particle of mass m & de-Broglie wavelength λ?
A. h/mλ B. 2h/mλ C. mh/λ D. (2hc/mλ)1/2 Right Answer: A .h/mλ
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