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ENTRANCE TEST – 2010 Multiple Questions and Answers.
| 16. | The minimum frequency below which no electron is emitted from the metal surface is called | ||
| A. | High frequency | ||
| B. | Low frequency | ||
| C. | Threshold frequency | ||
| D. | Resonance frequency | ||
| 17. | In pair production, the type of photon used | ||
| A. | α-particle | ||
| B. | β-particle | ||
| C. | X-rays | ||
| D. | γ-radiations | ||
| 18. | The life time of an electron in an excited state is about 10-8 s. What is its uncertainty in energy during this time? | ||
| A. | 1.05 x 10-41 J | ||
| B. | 1.05 x 10-26 J | ||
| C. | 1.15 x 1010 J | ||
| D. | 2.19 x 10-40 J | ||
| 19. | Velocity of electron moving in first orbit of hydrogen is | ||
| A. | 2.19 x 107 m/sec | ||
| B. | 2.18 x 107 m/sec | ||
| C. | 2.2 x 108 m/sec | ||
| D. | 2.19 x 106 m/sec | ||
| 20. | LASER is a potential energy source for inducing which type of reaction? | ||
| A. | Radioactive | ||
| B. | Fission | ||
| C. | Ionization | ||
| D. | Fusion | ||
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