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Q.68

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1117

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Short Answer

A beam of electrons is incident upon a gas of hydrogen atoms.

a. What minimum speed must the electrons have to cause the emission of 686 nm light from the transition of hydrogen?

b. Through what potential difference must the electrons be accelerated to have this speed?

the Short answer of transition's energy.

(a)

(b)

See the step by step solution

Step by Step Solution

Step: 1 Given information

(a).What do the electrodes have to cause the emission of 686 nm light from the transition of hydrogen?

Step 2: Calculation

We can begin the solution by expressing the transition's energy.

Step: 3 Given information

(a) the electrons be accelerated to have this speed

Step: 4 Calculation

b)

We can now use energy saving to our benefit:

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