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Matter Waves

If an electro...

Question

If an electron has an initial velocity in a direction different from that of an electric field, the path of the electron is :

A

a straight line

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B

a circle

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C

an ellipse

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D

a parabola

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Solution

The correct option is D a parabola
The path is a parabola, because initial velocity can be resolved into two rectangular components, one along $\to E$ and other perpendicular to $\to E$ . The former decreases at a constant rate and latter is unaffected. The resultant path is therefore a parabola.

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