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A particle has a mass 400 times than that of the electron and charge is double than that of a electron. It is accelerated by 5V of potential difference. Initially the particle was at rest, then its final kinetic energy will be
|
(a) 5 eV |
(b) 10 eV |
(c) 100 eV |
(d) 2000 eV |
The intensity of the electric field required to keep a water drop of radius 
just suspended in air when charged with one electron is approximately (g = 10 newton/kg e = 1.6 
|
(a) 260 volt/cm |
(b) 260 newton/coulomb |
|
(c) 130 volt/cm |
(d) 130 newton/coulomb |
A person uses spectacles of power +2D. He is suffering from
|
(a) Short sightedness or myopia |
(b) Long sightedness or hypermetropia |
|
(c) Presbyopia |
(d) Astigmatism |
When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters
|
(a) 1 : 2 |
(b) 2 : 1 |
(c) 4 : 1 |
(d) 1 : 4 |
Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be
|
(a) 100 days |
(b) 50 days |
(c) 33 days |
(d) 16 days |