2.3 Thermionic emission and its applications

• explain the production and properties of cathode rays in waves
• use CRO to analyze the frequency and amplitude of a wave
• describe the production and properties of X-rays
• determine the energy of X-rays using mathematical formulae
• explain safety precautions necessary when handling X-rays
• appreciate the applications of X-rays and CRO in day-to-day life

“How does a CRO and X-ray work?”

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1. Thermionic emission
   40 min · 1 practice tasks · quiz
   Explain thermionic emission and the work function.
2. Production of cathode rays
   40 min · 1 practice tasks · quiz
   Explain how cathode rays are produced.
3. Properties of cathode rays
   40 min · 1 practice tasks · quiz
   Describe the properties of cathode rays.
4. The cathode ray tube
   40 min · 1 practice tasks · quiz
   Describe the cathode ray tube and how the beam is deflected.
5. Uses of cathode rays
   40 min · 1 practice tasks · quiz
   Describe the uses of cathode rays and the cathode ray tube.
6. The cathode ray oscilloscope
   40 min · 1 practice tasks · quiz
   Describe the parts of the cathode ray oscilloscope and their functions.
7. Measuring voltage with the CRO
   40 min · 1 practice tasks · quiz
   Use the CRO to measure the amplitude of a voltage.
8. Measuring frequency with the CRO
   40 min · 1 practice tasks · quiz
   Use the CRO to measure the period and frequency of a wave.
9. Comparing frequencies with Lissajous figures
   40 min · 1 practice tasks · quiz
   Describe how the CRO shows Lissajous figures and compares frequencies.
10. Applications of the CRO
    40 min · 1 practice tasks · quiz
    Describe the applications of the cathode ray oscilloscope.
11. Production of X-rays
    40 min · 1 practice tasks · quiz
    Explain how X-rays are produced in an X-ray tube.
12. Properties of X-rays
    40 min · 1 practice tasks · quiz
    Describe the properties of X-rays.
13. The X-ray spectrum
    40 min · 1 practice tasks · quiz
    Describe the X-ray spectrum and the minimum wavelength.
14. Energy of X-rays
    40 min · 1 practice tasks · quiz
    Determine the energy of X-rays using E = hf and E = hc / lambda.
15. Medical applications of X-rays
    40 min · 1 practice tasks · quiz
    Describe the medical applications of X-rays.
16. Industrial and security uses of X-rays
    40 min · 1 practice tasks · quiz
    Describe the industrial and security applications of X-rays.
17. Hazards of X-rays
    40 min · 1 practice tasks · quiz
    Describe the hazards of X-rays to living things.
18. Safety precautions with X-rays
    40 min · 1 practice tasks · quiz
    Explain the safety precautions necessary when handling X-rays.
19. Appreciating the CRO and X-rays
    40 min · 1 practice tasks · quiz
    Appreciate the applications of the CRO and X-rays and the careers they support.
20. Review of thermionic emission and its applications
    40 min · 1 practice tasks · quiz
    Review thermionic emission, cathode rays, the CRO and the CRO and X-ray applications.