- A1, 2, 3...8
- B0, 1, 2...8
- Conly zero
- Donly odd numbers
Explanation:
Values of Principle quantum number are 1, 2, 3, 4.....8. 0 is not a Principle quantum number.
Only odd numbers are not Principle quantum numbers either.
Odd numbers, as well as even numbers, are Principle quantum number except 0 and negative integers.
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A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is
|
(a) 1.89 eV |
(b) 2.55 eV |
(c) 12.09 eV |
(d) 12.75 eV |
A small coil of N turns has area A and a current I flows through it. The magnetic dipole moment of this coil will be
|
(a) NI/A |
(b) |
(c) |
(d) NIA |

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
|
(a) Two times |
(b) Four times |
(c) Eight times |
(d) Sixteen times |
A laser beam of pulse power 1012 watt is focussed on an object are 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is
|
(a) 1020 |
(b) 1016 |
(c) 108 |
(d) 104 |