a) A graph between stopping potential ( \( V_o \) ) with the frequency ( f ) of incident radiation is shown in figure below. Answer the following…
Class 12 Physics · 2080 · Solved Question with Answer
a) A graph between stopping potential (\( V_o \)) with the frequency (f) of incident radiation is shown in figure below. Answer the following questions.
i) Write the Einstein photoelectric equation in terms of stopping potential.
ii) How will you determine Planck's constant from the graph?
iii) What happens to stopping potential if frequency of incident photon increases gradually? Justify.
b) In an experiment, voltage across two parallel plates is 50V and distance between them is 3cm. The magnetic field applied to make the beam undeflected is\( 10^{-4} \) Tesla.
i) Why electron beam remains undeflected?
ii) Calculate the velocity of electron passing through the fields?
OR
a) Define the term radioactivity.
b) Two radioactive samples A and B have equal number of atoms initially. Their half lives are 3 hours and 9 hours respectively. Compare their rate of disintegration after 18 hours from start.
c) Develop a relation between half life and decay constant of a radioactive sample.
d) What percentage of atoms decayed after five half life periods? Justify your answer with calculation.
Graph :