- AE = mc2
- BThe photoelectric effect
- CQuantisation of charge
- DMagic of light
Explanation:
The photoelectric effect.
In 1905, Albert Einstein published a paper in advancing hypothesis that the light energy I'd being carried in discrete quantized packets to explain experimental data from photoelectric effect. This model contributed the development of quantum mechanics.
Photoelectric effect refers to the emission, or rejection of electrons grim the surface of generally a metal in response to the incident light.
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The charge on a capacitor of capacitance 10 μF connected as shown in the figure is
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(a) 20 μC |
(b) 15 μC |
(c) 10 μC |
(d) Zero |
Assertion : A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason : The surface density of charge on the plate remains constant or unchanged.
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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. |
Four modifications are suggested in the lens formula to include the effect of the thickness t of the lens. Which one is likely to be correct?
When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like
|
(a) A conductor |
(b) An insulator |
(c) A super-conductor |
(d) A semi-conductor |
Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
|
(a) Zero |
(b) Along the diagonal AC |
|
(c) Along the diagonal BD |
(d) Perpendicular to side AB |
The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along
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(a) The same direction but differ in phase by 90° |
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(b) The same direction and are in phase |
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(c) Mutually perpendicular directions and are in phase |
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(d) Mutually perpendicular directions and differ in phase by 90° |
A narrow beam of white light goes through a slab having parallel faces.