The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |
(d) 8
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If scattering particles are 56 for 90° angle then this will be at 60° angle
|
(a) 224 |
(b) 256 |
(c) 98 |
(d) 108 |
Wavefront means
|
(a) All particles in it have same phase |
|
(b) All particles have opposite phase of vibrations(c) Few particles are in same phase, rest are in opposite phase |
|
(c) Few particles are in same phase, rest are in opposite phase |
|
(d) None of these |
The direction of induced e.m.f. during electromagnetic induction is given by
|
(a) Faraday's law |
(b) Lenz's law |
(c) Maxwell's law |
(d) Ampere's law |
In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be

|
(a) 0.9 V |
(b) 0.5 V |
(c) 0.4 V |
(d) 0.1 V |
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
The focal length of the objective of a compound microscope if fo and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument: