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Q. The potential difference between two parallel conducting plates in vacuum is 600 V. An alpha particle with mass of 6.50×10-27 kg and charge of 3.20×10-19 C is released from rest near the positive plate. What is the kinetic energy of the alpha particle when it reaches the other plate? The distance between the plates is 19.0 cm.

Q. A slide projector needs to create a 96.0 cm-high image of a 2.20 cm-tall slide. The screen is 296 cm from the slide.

How far should you place the lens from the slide?

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