MCQ
Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++ atom in the 2nd excited state:
- AE
- B3E
- C6E
- D9E
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A element used for radioactive carbon dating for more than 5600 years is
|
(a) C - 14 |
(b) U - 234 |
(c) U - 238 |
(d) Po - 94 |
$\lambda\geq\lambda_0$
$\lambda\geq2\lambda_0$
$\lambda\leq\lambda_0$
$\lambda<\frac{\lambda_ 0}{2}.$
A condenser has a capacity 2μF and is charged to a voltage of 50 V. The energy stored is
|
(a) 25 × 105 Joule |
(b) 25 Joule |
(c) 25 × 10 erg |
(d) 25 × 103 erg |
The focal length of a concave mirror is 50 cm. Where an object be placed so that its image is two times and inverted
|
(a) 75 cm |
(b) 72 cm |
(c) 63 cm |
(d) 50 cm |