Electric Charges and Fields — Physics STD 12 Science — Question

In series combination of resistances:

The output of the given circuit in Figure.

The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be

(a) 12.4 eV

(b) 6.2 eV

(c) 100 eV

(d) 200 eV

Two short magnets of equal dipole moments M are fastened perpendicularly at their centre (figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is:

Diffusion current in a p-n junction is greater than the drift current in magnitude:

The two waves represented by y₁ = a sin(wt) and   have a phase difference of

(a) 0

(b)

(c)

(d)

A proton and an a-particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an a-particle is

(a)

(b) 2 : 1

(c) 2

(d)

Which of the following wave is used in long distance communication?