The figure below shows two parallel metal plates PQ and RS in an evacuated enclosure. The separation of the plate is 15 mm and PQ is at a potential +100 V relative to RS. A and B are two slits in the plate PQ separated by 25 mm. A collimated beam containing electrons of different kinetic energy is directed at A at an angle of 60° to the plate, as shown. R OV 15 mm A B +100 V Q 60° 25 mm (a) Find the initial kinetic energy of the electrons that just reach the plate RS. (b) Find the magnitude of the initial velocity of the electrons that emerge from B.
The figure below shows two parallel metal plates PQ and RS in an evacuated enclosure. The separation of the plate is 15 mm and PQ is at a potential +100 V relative to RS. A and B are two slits in the plate PQ separated by 25 mm. A collimated beam containing electrons of different kinetic energy is directed at A at an angle of 60° to the plate, as shown. R OV 15 mm A B +100 V Q 60° 25 mm (a) Find the initial kinetic energy of the electrons that just reach the plate RS. (b) Find the magnitude of the initial velocity of the electrons that emerge from B.
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Transcribed Image Text:The figure below shows two parallel metal plates PQ and RS in an evacuated
enclosure. The separation of the plate is 15 mm and PQ is at a potential +100 V relative
to RS. A and B are two slits in the plate PQ separated by 25 mm. A collimated beam
containing electrons of different kinetic energy is directed at A at an angle of 60° to the
plate, as shown.
R
OV
S
15 mm
A
B
+100 V
Q
60°
25 mm
(a) Find the initial kinetic energy of the electrons that just reach the plate RS.
(b) Find the magnitude of the initial velocity of the electrons that emerge from B.
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