MCQ
Two waves having same intensity $I _0$ and originated from two non-coherent sources superpose at a point. The average intensity at that point is ___________ .
- A$I _0$
- ✓$2 I _0$
- C$3 I _0$
- D$4 I _0$
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There is no atmosphere on moon because
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(a) There is no vegetation |
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(b) The escape velocity at its surface is very low |
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(c) Diffusion constant of gases is high |
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(d) There is vacuum in space |
A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector
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(a) 2 photon of energy 10.2 eV |
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(b) 2 photon of energy of 1.4 eV |
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(c) One photon of energy 10.2 eV and an electron of energy 1.4 eV |
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(d) One photon of energy 10.2 eV and another photon of 1.4 eV |
Assertion : In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged.
Reason : The photoelectric current depends only on wavelength of light.
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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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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(d) If the assertion and reason both are false. |