In Young's double slit experiment, the slits are 0.5 mm apart and interference pattern is observed on a screen placed at a distance of 1.0 m from the plane containing the slits. If wavelength of the incident light is 6000 Å, then the separation between the third bright fringe and the central maxima is
|
(a) 4.0 mm |
(b) 3.5 mm |
(c) 3.0 mm |
(d) 2.5 mm |
(b) 3.5 mm
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Four metallic plates each with a surface area of one side A are placed at a distance d from each other. The plates are connected as shown in the circuit diagram. Then the capacitance of the system between a and b is
|
(a) |
(b) |
(c) |
(d) |
In a current carrying long solenoid, the field produced does not depend upon
|
(a) Number of turns per unit length |
(b) Current flowing |
|
(c) Radius of the solenoid |
(d) All of the above three |
At noon the sun appears white because:
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1 × 10–7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be
|
(a) 1 V |
(b) 2 V |
(c) 3 V |
(d) Zero |
A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be 
to its value at the centre of the coil, is
|
(a) |
(b) R |
(c) 2 |
(d) |
According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
|
(a) |
(b) |
(c) |
(d) |
In Bohr’s model, if the atomic radius of the first orbit is 
, then the radius of the fourth orbit is
|
(a) |
(b) 4 |
(c) |
(d) 16 |
