1
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The maximum velocity of the photoelectron emitted by the metal surface is ' $v$ '. Charge and mass of the photoelectron is denoted by ' $e$ ' and ' $m$ ' respectively. The stopping potential in volt is

A
$\frac{v^2}{2\left(\frac{m}{e}\right)}$
B
$\frac{v^2}{2\left(\frac{e}{m}\right)}$
C
$\frac{v^2}{\left(\frac{e}{m}\right)}$
D
$\frac{v^2}{\left(\frac{m}{e}\right)}$
2
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The equi-convex lens has a focal length ' $f$ '. If the lens is cut along the line perpendicular to the principal axis and passing through the pole, what will be the focal length of any half part?

A
$\frac{f}{2}$
B
$2f$
C
$\frac{3 f}{2}$
D
$f$
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