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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 19.5 | Electromagnetic Wave Packet. The Uncertainty Principle |
1. Calculate the spatial extension of a sound wave packet for a source that produces 200 oscillations in the medium during 0.1 s if the sound speed in air in the specific case is 340 m/s.
Correct Answer: B
2. A neutron is moving at 2500 m/s but the error in measurement of velocity is 0.2%. Calculate the width Δk of wave packet. Take the mass of neutron as m = 1.675 × 10-27 kg.
Correct Answer: D
3. The atom of a chemical element has a 50 eV energy during a cycle of radiation and the uncertainty of energy measurement is 4%. How long does the atom have the given value of energy during this cycle?
Correct Answer: D
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