Modern Physics 7 Question 35
36. 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
$(2005,2 M)$
(b) fringe width increases
(c) fringe width decreases
(d) fringe width remains same
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Solution:
- As velocity ( or momentum) of electron is increased, the wavelength $\lambda=\frac{h}{p}$ will decrease. Hence, fringe width will decrease $(\omega \propto \lambda)$.
