What is the de-Broglie wavelength of the α - particle accelerated through a potential difference V
|
(a) |
(b) |
(c) |
(d) |
What is the de-Broglie wavelength of the α - particle accelerated through a potential difference V
|
(a) |
(b) |
(c) |
(d) |
(c)
Å
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A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be-
The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct
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(a) Lines of force minimum but induced e.m.f. is zero |
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(b) Lines of force maximum but induced e.m.f. is zero |
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(c) Lines of force maximum but induced e.m.f. is not zero |
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(d) Lines of force maximum but induced e.m.f. is also maximum |
Potential gradient is defined as
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(a) Fall of potential per unit length of the wire |
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(b) Fall of potential per unit area of the wire |
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(b) Fall of potential per unit area of the wire |
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(d) Potential at any one end of the wire |
In the disintegration series the values of Z and A respectively will be
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(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
In hydrogen atom, if the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
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(a) 13.2 E |
(b) 7.2 E |
(c) 5.6 E |
(d) 3.2 E |
The radius of hydrogen atom in its ground state is 5.3 . After collision with an electron it is found to have a radius of 21.2
. What is the principal quantum number n of the final state of the atom
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(a) n = 4 |
(b) n = 2 |
(c) n = 16 |
(d) n = 3 |