An electron passing through a potential difference of 4.9 V collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state
|
(a) 2050 Å |
(b) 2240 Å |
(c) 2525 Å |
(d) 2935 Å |
(c) 2525 Å
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The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is
|
(a) 10888 Å |
(b) 1088.8 Å |
(c) 108.88 Å |
(d) 10.888 Å |
If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be
|
(a) 0.5 |
(b) 0.5 |
(c) 5 |
(d) 5 |
Complete the reaction 
(a) 
|
(b) 
|
(c) 
|
(d) 
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A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of
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(a) |
(b) |
(c) |
(d) |
Four metallic plates each with a surface area of one side A are placed at a distance d from each other. The plates are connected as shown in the circuit diagram. Then the capacitance of the system between a and b is
|
(a) |
(b) |
(c) |
(d) |
A condenser of 2mF capacitance is charged steadily from 0 to 5 Coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condenser
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(a)
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(a)
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(c)
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(d)
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Which one of the following is not electromagnetic in nature
|
(a) X-rays |
(b) Gamma rays |
(c) Cathode rays |
(d) Infrared rays |
