A crystal diffracts a beam of electrons, like a diffraction grating, as they hit it perpendicular to its surface. The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface

(e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s)
(a) What is the wavelength of the electrons?
(b) What potential difference accelerated the electrons if they started from rest?


(a) 0.18 nm
(b) 48 V

Physics & Space Science

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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of



a.
A

b.
B.

c.
C.

d.
D.

e.
E.

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a. True b. False Indicate whether the statement is true or false

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