- Ano holes are created
- B1 hole is created
- C2 holes are created
- D4 holes are created
Explanation:
For one electron vacancy, an empty space or void is created. In order to fill that empty space, a charge carrier with a charge equal in magnitude but opposite polarity should occupy that space in order to maintain electrical neutrality. Such a charge particle is called a hole.
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has half life 5700 years. At the end of 11400 years, the actual amount left is
|
(a) 0.5 of original amount |
(b) 0.25 of original amount |
|
(c) 0.125 of original amount |
(d) 0.0625 of original amount |
Pick out the longest wavelength from the following types of radiations
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(a) Blue light |
(b) g-rays |
(c) X-rays |
(d) Red light |
Light is an electromagnetic wave. Its speed in vacuum is given by the expression
|
(a) |
(b) |
(c) |
(d) |
A cathode emits 1.8
electrons per second, when heated. When 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6
. The maximum anode current is
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(a) 2.7 μA |
(b) 29 μA |
(c) 72 μA |
(d) 29 μA |
Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red 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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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |