MCQ
The EMF of a cell can be defined as:
- AWork done in taking a unit positive charge once round the circuit.
- BThe open circuit voltage of the cell.
- CThe terminal voltage when the current is zero.
- DAll the above.
Explanation:
EMF of cell can be defined as:
→ Workdone in taking unit positive charge once round the circuit.
→ The open circuit voltage of cell.
→ The terminal voltage when current is zero.
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If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be
|
(a) |
(b) |
(c) |
(d) |
When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)
|
(a) 2hc |
(b) |
(c) |
(d) 0.5 |