Wave Optics — Physics STD 12 Science — Question

Consider the situation shown in figure. The wire AB is slid on the fixed rails with a constant velocity. If the wire AB is replaced by a semicircular wire, the magnitude of the induced current will: 

To increase both the resolving power and magnifying power of a telescope:

As one considers orbits with higher values of n in a hydrogen atom, the electric potential energy of the atom?

The capacitor of capacitance 4 μF  and 6 μF  are connected in series. A potential difference of  500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF  capacitance is

(a) 500 volts

(b) 300 volts

(c) 200 volts

(d) 250 volts

A point object is placed at the center of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is

(a) 2 cm

(b) 4 cm

(c) 6 cm

(d) 12 cm

The true statement is, on increasing the distance between the plates of a parallel plate condenser

(a)  The electric intensity between the plates will decrease

(b) The electric intensity between the plates will increase

(c) The electric intensity between the plates will remain unchanged

(d) The P.D. between the plates will decrease

Huygen's concept of wavelets is useful in:

Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?

1. Frequency.
2. Energy.
3. Penetrating power.
4. Method of creation.

A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

(a) 66.6%

(b) 85.5%

(c) 62.5%

(d) 75%

Which of the following is quantised according to Bohr’s theory of hydrogen atom

(a) Linear momentum of electron	(b) Angular momentum of electron
(c) Linear velocity of electron	(d) Angular velocity of electron