Moving Charges and Magnetism — Physics STD 12 Science — Question

Vertical component of earth's magnetic field is zero:

Assertion  : The electron in the hydrogen atom passes from energy level n = 4 to the n = 1 level. The maximum and minimum number of photon that can be emitted are six and one respectively.
Reason      : The photons are emitted when electron make a transition from the higher energy state to the lower energy state. (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.

Express which of the following setups can be used to verify Ohm’s law

Among the two interfering monochromatic sources A and B; A is ahead of B in phase by 66°. If the observation be taken from point P, such that PB – PA = l/4. Then the phase difference between the waves from A and B reaching P is (a) 156°(b) 140°(c) 136°(d) 126°

In a Young’s double slit experiment, the slit separation is 1 mm and the screen is 1 m from the slit. For a monochromatic light of wavelength 500 nm, the distance of 3rd minima from the central maxima is (a) 0.50 mm(b) 1.25 mm(c) 1.50 mm(d) 1.75 mm

Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is(a) 10W  (b) 5W(c) 20W   (d) None of these

 Identify the conclusion of the photoelectric experiment from the following.

The chromatic Aberration in lenses becomes due to(a) Disimilarity of main axis of rays (b) Disimilarity of radii of curvature(c) Variation of focal length of lenses with wavelength(d) None of these