(A) 31 %
(B) 0.3 %
(C) 3.125 %
(D) 1 %
Tag: Physics Mcqs
Decay of one radioactive nucleus per second is equal to:
(A) One curei
(B) One Becquerel
(C) One half-life
(D) One Henry
Half-life of a radioactive substance depends upon?
(A) Temperature
(B) Pressure
(C) Nature of substance
(D) Electric and magnetic field
The decay constant λ of a radioactive sample:
(A) Decreases as the age of atoms increase
(B) Increases as the age of atoms increase
(C) Is independent of the age of atom
(D) Depends on the nature of activity
SI unit of radioactivity is:
(A) Curie
(B) Becquerel
(C) Roentgen
(D) Rutherford
In order to increase the kinetic energy of ejected photoelectrons, there should be an increase in:
(A) intensity of radiation
(B) wavelength of radiation
(C) frequency of radiation
(D) both wavelength and intensity of radiation
The maximum energy of the electrons released in a photocell is independent of:
(A) frequency of incident light
(B) intensity of incident light
(C) nature of cathode rays
(D) none of these
The work function of a metal in 4 eV. For the emission of photoelectrons of zero velocity from the metal surface, the wavelength of the incident radiation should be:
(A) 1700 A degree
(B) 3100 A degree
(C) 2700 A degree
(D) 5900 A degree