Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Radiations of intensity 0.5  are striking a metal plate. The pressure on the plate is

(a) 0.166	(b) 0.332
(c) 0.111	(d) 0.083

If an element has 22 electrons then what will be its atomic number?

A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

(a) 2eV

(b) 2J

(c) 2kJ

(d) 2keV

A curve between magnetic moment and temperature of magnet is

(a)

(b)

(c)

(d)

In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon

(a) Intensity of light	(b) Frequency of incident light
(c) Velocity of incident light	(d) Both intensity and velocity of light

Fusion reaction is also known as ..........:

A particle of charge q and mass m is moving along the x -axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below for which figure the net force on the charge may be zero

(a)

(b)

(c)

(d)

Which of the following best describes the field due to a magnet ?

Consider the situation of the previous problem. The directions of the magnetic field due to the dipole are opposite at:

Digital signals are :