Kinetic energy of emitted cathode rays is dependent on
|
(a) Only voltage |
|
(b) Only work function |
|
(c) Both (a) and (b) |
|
(d) It does not depend upon any physical quantity |
(c) Both (a) and (b)
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Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |
Assertion : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.
Reason : Force is directly proportional to the magnetic field applied.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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 assertion is false but reason is true. |
Atomic mass number of an element thorium is 232 and its atomic number is 90. The end product of this radioactive element is an isotope of lead (atomic mass 208 and atomic number 82). The number of alpha and beta particles emitted is
|
(a) α = 3, β = 3 |
(b) α = 6, β = 4 |
(c) α = 6, β = 0 |
(d) α = 4, β = 6 |
Magnetic intensity for an axial point due to a short bar magnet of magnetic moment M is given by
|
(a) |
(b) |
(c) |
(d) |
