Magnetism and Matter — Physics STD 12 Science — Question

Two capacitors each of capacity C are connected in parallel. The equivalent capacity is :

A light rays beam enters from air into water. Out of the following which will not be changed ?

Which one of the following statements is correct(a) In vacuum, the speed of light depends upon frequency(b) In vacuum, the speed of light does not depend upon frequency(c) In vacuum, the speed of light is independent of frequency and wavelength(d) In vacuum, the speed of light depends upon wavelength

You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase does not depend on:

1. The path taken by the suitcase.
2. The time taken by you in doing so.
3. The weight of the suitcase.
4. Your weight.

The de-Broglie wavelength of an electron in the first Bohr orbit is (a) Equal to one fourth the circumference of the first orbit(b) Equal to half the circumference of the first orbit(c) Equal to twice the circumference of the first orbit(d) Equal to the circumference of the first orbit

The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature(a) Decreases exponentially with increasing band gap(b) Increases exponentially with increasing band gap(c) Decreases with increasing temperature (d) Is independent of the temperature and the band gap

Consider the following two statements regarding a linearly polarised, plane electromagnetic wave:

1. The electric field and the magnetic field have equal average values.
2. The electric energy and the magnetic energy have equal average values.

According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be