(A) Because access to materials in the official Disney archives is tightly controlled
(B) Because they have been “ghost written” by other authors
(C) Because they are not representative of all great figures in cartoon history
(D) Because he never enjoyed watching Lady and the Tramp as a child
Author:
What are Scott’s four criteria for assessing the quality of documents?
(A) Credibility, reliability, accuracy and meaning
(B) Comprehensiveness, accuracy, value and rigour
(C) Authenticity, credibility, representativeness and meaning
(D) Objectivity, subjectivity, authenticity and value
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
The threshold wavelength for a photosensitive surface is 6000 Ao and the wavelength of incident light is 5000 Ao. Then the maximum energy of emitted electrons would be:
(A) 0.041 eV
(B) 0.41 eV
(C) 4.1 eV
(D) 41 eV
Photoelectric effect is the phenomenon in which:
(A) Photons come out of a metal when it is hit by a beam of electrons
(B) Photons come out of the nucleus of an atom under the action of an electric field
(C) Electrons come out of a metal with a constant velocity which depends on the frequency and intensity of incident radiation
(D) Electrons come out of a metal with different velocities not greater than a certain value which depends only on the frequency of the incident light and not on its intensity
A photon of energy 3.4 eV is incident on a metal having work function 2 eV. The maximum kinetic energy of photoelectrons is equal to:
(A) 1.4 eV
(B) 1.7 eV
(C) 5.4 eV
(D) 6.8 eV