Explanation:
de – Broglie hypothesis did modify Bohr’s second postulate.
This postulate of Bohr regarding the quantization of the angular momentum of an electron was further explained by Louis de Broglie.
According to de – Broglie, a moving electron in its circular orbit behaves like a particle-wave.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
During mean life of a radioactive element, the fraction that disintegrates is
|
(a) e |
(b) |
(c) |
(d) |
The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be
|
(a) 5 μF |
(b) 10 μF |
(c) 20 μF |
(d) 40 μF |
An electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. Given the Rydberg's constant 
. The frequency in Hz of the emitted radiation will be
|
(a) |
(b) |
(c) |
(d) |
Assertion : The specific charge for positive rays is a characteristic constant.
Reason : The specific charge depends on charge and mass of positive ions present in positive rays.
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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. |
Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e.
. If 
are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct
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(a) |
(b) |
(c) |
(d) |
In the above question, the resistance between the square faces is
|
(a) 3 |
(b) 3 |
(c) 3 |
(d) 3 |
A beam of well collimated cathode rays travelling with a speed of 5 
enter a region of mutually perpendicular electric and magnetic fields and emerge undeviated from this region. If |B| = 0.02T, the magnitude of the electric field is
|
(a) |
(b) 2.5 |
(c) 1.25 |
(d) 2 |
The potential difference between points A and B of adjoining figure is
(a) 
|
(b) 
|
(c) |
(d) 2 V |
