A Horizontally Projected Beam of Electrons Travels at 55 Km/s

question 22

Multiple Choice

A horizontally projected beam of electrons travels at 55 km/s into the space between two horizontal, parallel plates. The plates are separated by 7.4 cm, and they are 12 cm long. The uniform electric field between the plates is 7.2 mV/m upward. If the beam enters the region at a height of 3.7 cm above the lower plate, at what height above the lower plate does the beam exit the region? The electron mass is 9.11 × 10^-31 kg.

• A) 0.9 cm
• B) 2.3 cm
• C) 3.4 cm
• D) 4.6 cm

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