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Chapter 37: Given Information (page 1081)

11. An alpha particle (a bare helium nucleus with q=+2e) accelerates across a 100V potential difference, starting from rest. What is the particle’s kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.

Short Answer

Expert verified

As, We know

KE=qV

So, by putting given values into the equation:

KE= 100x2 =200 eV

Step by step solution

01

Description

The formula for energy in terms of charge and potential difference is

Kinetic energy = potential difference x charge

KE=qV

So, by putting given values of charge q=+2e

And, Potential difference between the plates V=100Volt

into the equation:

KineticEnergy=2e×100V=200eV

So, the particle’s kinetic energy when it reaches the negative electrode is

200eV.

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Most popular questions from this chapter

An electron in a cathode-ray beam passes between 2.5cm-long parallel-plate electrodes that are 5.0mm apart. A 2.0mT, 2.5-cm-wide magnetic field is perpendicular to the electric field between the plates. The electron passes through the electrodes without being deflected if the potential difference between the plates is 600V.

a. What is the electron’s speed?

b. If the potential difference between the plates is set to zero, what is the electron’s radius of curvature in the magnetic field?

A brass plate at room temperature radiates 10 W of blackbody radiation. If the plate is cooled to –30°C, does the peak of maximum radiated intensity shift toward shorter wavelengths, shift toward longer wavelengths, or remain the same? Explain.

An oil droplets with 15 excess electrons is observed between two parallel electrodes spaced 12 mm apart. The droplet hangs motionless when the upper electrode is 25V more positive than the lower electrode. The density of the oil is 860 kg/m3. What is the radius of the droplet?

Your friend flies from Los Angeles to New York. She carries an accurate stopwatch with her to measure the flight time. You and your assistants on the ground also measure the flight time.

a. Identify the two events associated with this measurement.

b. Who, if anyone, measures the proper time?

c. Who, if anyone, measures the shorter flight time?

A brass plate at room temperature radiates10W of blackbody radiation. If the plate is cooled to -30°C, does the peak of maximum radiated intensity shift toward shorter wavelengths, shift toward longer wavelengths, or remain the same? Explain.
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