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प्रश्न
Name the unit in which the work function of a metal is expressed.
उत्तर
A work function of a metal is expressed in terms of the electron volt (eV).
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संबंधित प्रश्न
Under which conditions does the nucleus of an atom tend to radioactive?
What happens if the negative potential is changed on a grid?
Draw a diagram of a simple atom showing the nucleus and electrons. In this atom:
(a) What type of charge will there be on the nucleus?
(b) What is the value of this charge?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
A certain nucleus A (mass number 238 and atomic number 92) is radioactive and becomes a nucleus B (mass number 234 and atomic number 90) by the loss of one particle.
What particle was emitted?
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
How is a cathode ray beam affected while passing through an electric field?
State any two uses of cathode rays.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
