Explanation:
Two photons having equal linear momenta have equal wavelengths is correct. As in the rest of the options magnitude of momentum or energy can be same because energy and momentum are inversely proportional to wavelength. But the direction of propagation of the photons can be different.
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A proton moving with a velocity, 2.5 
, enters a magnetic field of intensity 2.5T making an angle 30° with the magnetic field. The force on the proton is
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(a) 3 |
(b) 5 |
(c) 6 |
(d) 9 |
The wiring of a house has resistance 6Ω A 100 W bulb is glowing. If a geyser of 1000 W is switched on, the change in potential drop across the bulb is nearly
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(a) Nil |
(b) 23 V |
(c) 32 V |
(d) 12 V |
Assertion : V-i characteristic of P-N junction diode is same as that of any other conductor.
Reason : P-N junction diode behave as conductor at room temperature.
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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. |
he half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 
th part
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(a) 12 h |
(b) 16 h |
(c) 48 h |
(d) 192 h |
A particle of charge q and mass m is moving along the x -axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below for which figure the net force on the charge may be zero
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(a)
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(b)
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(c)
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(d)
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In a nuclear reaction, which of the following is conserved
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(a) Atomic number |
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(b) Mass number |
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(c) Atomic number, mass number and energy |
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(d) None of these |
