S.No | Questions |

Question 1 | State Einstein’s postulates of Special Theory of Relativity. Discuss its results. See Answer |

Question 2 | What are the main features of the thermal radiations from a black body? Discuss Planck’s quantum theory and its importance in Physics. See Answer |

Question 3 | What are the main features of photoelectric effect? Discuss the failure of classical Physics and success of photon concept in explaining the effect. See Answer |

Question 4 | What is Compton Effect? Develop a mathematical relation for the Compton shift. See Answer |

Question 5 | Write note on pair production and annihilation of matter. See Answer |

Question 6 | What is de’ Broglie’s hypothesis? Describe an experiment to show that particle has wave characteristics. See Answer |

Question 7 | What is meant by wave-particle duality? Explain. See Answer |

Question 8 | State and explain Hysenberg’s uncertainty principle. Justify the validity of this principle by a thought experiment. See Answer |

Numerical Problems included in the theory.

Problem | The rest mass of an electron is 9.11 × 10^{-31} kg. Calculate the corresponding rest energy.See Answer |

Problem | A space ship is measured 100 m long while it is at rest with respect to an observer of this ship now flies by the observer with a speed of 0.99c. What length will the observer find for the spaceship? See Answer |

Problem | A traveler on a train with a speed of 0.8c, picks up and open a newspaper. The event takes 1.0 s as measured by the train traveler. What would be the time observed by the person standing by the side of the track? See Solution |

Problem | Superman, who has an exceptionally strong arm, throws a fast ball with a speed of 0.9 c. If the rest mass of the ball is 0.5 kg, what is its mass in flight? See Solution |

Problem | The temperature of the skin is approximately 35 deg C. What is the wavelength at which the peak occurs in the radiation emitted from the skin? See Solution |

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