The Electrons in a Beam Are Moving At $18 \mathrm {~m} / \mathrm { s }$

question 13

Short Answer

The electrons in a beam are moving at $18 \mathrm {~m} / \mathrm { s }$ . ( $m _ { \text {electron } } = 9.11 \times 10 ^ { - 31 } \mathrm {~kg} , h = 6.626 \times$ $10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s }$ )
(a) What is its de Broglie wavelength these electrons?
(b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of $30 ^ { \circ }$ with the normal to the grating?

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Definitions:

Rectus Femoris

One of the four quadriceps muscles of the thigh, responsible for extending the knee and flexing the thigh.

Vastus Lateralis

The Vastus Lateralis is one of the four muscles of the quadriceps group, located on the side of the thigh, primarily responsible for extending the knee.

Vastus Medialis

A muscle located in the thigh, part of the quadriceps group, which plays a crucial role in knee extension.

Thenar Muscles

The thenar muscles are a group of muscles on the palm of the hand, primarily responsible for the movements of the thumb.