Question

A positively charged particle is moving along X-axis has De-Broglie wavelength ‘ λ ’. Now a magnetic field is switched on in +Y direction. Find the new wavelength when particle’s velocity becomes parallel to +Z direction :-

(1) \(\frac{\lambda}{\sqrt{2}}\)

(2) \(\lambda\)

(3) \(\frac{\lambda }{3}\)

(4) \(\frac{\lambda}{4}\)

Answer 1

Correct option is : (2) \(\lambda\)

\(\lambda = \frac{h}{p} = \frac{h}{mv}\)

\(\lambda ' = \lambda \)