- APhoto electric effect
- BCompton effect
- CTheory of relativity
- DNone of the above
Explanation:
The noble prize in Physics 1921 was awarded to Albert Einstein for his services to theoretical Physics and especially for his discovery of the two of the photoelectric effect
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A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct

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(a) X is P-type, Y is N-type and the junction is forward biased |
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(b) X is N-type, Y is P-type and the junction is forward biased |
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(c) X is P-type, Y is N-type and the junction is reverse biased |
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(d) X is N-type, Y is P-type and the junction is reverse biased |
$\frac{1}{\text{r}}$
$\frac{1}{\text{r}^2}$
$\frac{1}{\text{r}^3}$
None of these.
Solar energy is mainly caused due to
|
(a) Fission of uranium present in the sun |
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(b) Fusion of protons during synthesis of heavier elements |
|
(c) Gravitational contraction |
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(d) Burning of hydrogen in the oxygen |
Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be
|
(a) |
(a) |
(c) |
(d) |
An electron has mass 9 and charge 1.6
is moving with a velocity of
, enters a region where magnetic field exists. If it describes a circle of radius 0.10 m, the intensity of magnetic field must be
|
(a) 1.8 |
(b) 5.6 |
(c) 14.4 |
(d) 1.3 |
During mean life of a radioactive element, the fraction that disintegrates is
|
(a) e |
(b) |
(c) |
(d) |