An electron having mass $m$ and kinetic energy $K$ enter in uniform magnetic field $B$ perpendicularly, then its frequency will be
An electron having mass $m$ and kinetic energy $K$ enter in uniform magnetic field $B$ perpendicularly, then its frequency will be
- [AIPMT 2001]
- A
$\frac{e K}{q v B}$
- B
$\frac{e B}{2 \pi m}$
- C
$\frac{2 \pi m}{e B}$
- D
$\frac{2 m}{e B K}$
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- [AIPMT 2013]
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