- AUltraviolet rays
- ✓X-rays
- CInfrared radiations
- DMicro waves
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In an experiment on photoelectric effect the frequency f of the incident light is plotted against the stopping potential
. The work function of the photoelectric surface is given by (e is electronic charge)

|
(a) OB × e in eV |
(b) OB in volt |
|
(c) OA in eV |
(d) The slope of the line AB |
Assertion : A potentiometer of longer length is used for accurate measurement.
Reason : The potential gradient for a potentiometer of longer length with a given source of e.m.f. becomes small.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
If the atom follows the Bohr model and the radius of
is n times the Bohr radius, then find n
|
(a) 100 |
(b) 200 |
(c) 4 |
(d) |
In Millikan oil drop experiment, a charged drop of mass 1.8
is stationary between its plates. The distance between its plates is 0.90 cm and potential difference is 2.0 kilo volts. The number of electrons on the drop is
|
(a) 500 |
(b) 50 |
(c) 5 |
(d) 0 |
An electron enters between two horizontal plates separated by 2mm and having a potential difference of 1000V. The force on electron is
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |