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Some radioactive nucleus may emit
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(a) Only one α,β or γ at a time |
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(b) All the three α,β and γ one after another |
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(c) All the three α,β and γ simultaneously |
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(d) Only α and β simultaneously |
Assertion : In a movie, ordinarily 24 frames are projected per second from one end to the other of the complete film.
Reason : The image formed on retina of eye is sustained upto 1/10 second after the removal of stimulus.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
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(a) Circular |
(b) Elliptical |
(c) Parabola |
(d) None of these |
The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000Å falls on it. The potential difference applied to stop the fastest photo-electrons is [h = 4.14 
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(a) 1.2 volts |
(b) 2.24 volts |
(c) 3.6 volts |
(d) 4.8 volts |