Dual Nature of Matter and Radiation MCQ Questions & Answers in Modern Physics | Physics
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151.
A beam of electron is used in an YDSE experiment. The slit width is $$d.$$ When the velocity of electron is increased, then
A
no interference is observed
B
fringe width increases
C
fringe width decreases
D
fringe width remains same
Answer :
fringe width decreases
Note : Since electron shows wave nature, it will show the phenomenon of interference.
For electron, $$\lambda = \frac{h}{{mv}}$$
When speed of electron increases, $$\lambda $$ will decrease. The distance between two consecutive fringes
$$\beta = \frac{{\lambda D}}{d}$$
As $$\lambda $$ decreases, $$\beta $$ also decrease.