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  • Question
  • Once the active medium is excited, the first photons of light are produced by which physical process?


  • Options
  • A. Blackbody radiation
  • B. Spontaneous emission
  • C. Synchrotron radiation
  • D. Planck?s oscillation

  • Correct Answer
  • Spontaneous emission 

    Explanation
    Spontaneous emission is what you see with most "glow in the dark" toys. You excite the toy by exposing it to bright light, then the toy glows in the dark by spontaneously emitting photons as the excited atoms relax back down to their normal state.

  • More questions

    • 1. What do African-American football players Ernie Davis, Archie Griffin, and Tony Dorsett have in common?

    • Options
    • A. They all played for Pittsburgh
    • B. They all won the Heisman Trophy
    • C. They all led to Super Bowl titles
    • D. They dont have any similarity
    • Discuss
    • 2. Which English county did batting sensation Virender Sehwag join in the 2003 season?

    • Options
    • A. Lancashire
    • B. Leicestershire
    • C. Yorkshire
    • D. Middlesex
    • Discuss
    • 3. The invention of the transistor, or semiconductor, was one of the most important developments leading to the personal computer revolution. What company invented the transistor in 1947?

    • Options
    • A. International Business Machines
    • B. MITS
    • C. Xerox
    • D. Bell Laboratories
    • Discuss
    • 4. Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?

    • Options
    • A. Exact concentration of solution is not given
    • B. Character of semi permeable membrane is not given
    • C. The flow of solution is not possible through semi permeable membrane
    • D. All are incorrect
    • Discuss
    • 5. Ordinary table salt is sodium chloride. What is baking soda?

    • Options
    • A. Potassium chloride
    • B. Potassium carbonate
    • C. Potassium hydroxide
    • D. Sodium bicarbonate
    • Discuss
    • 6. Chemical formula for water is

    • Options
    • A. NaAlO2
    • B. H2O
    • C. Al2O3
    • D. CaSiO3
    • Discuss
    • 7. Who is the author of famous statement: "That Government is the best which governs least"?

    • Options
    • A. Herbert Spencer
    • B. Harold Laski
    • C. Alexis De Tocqueville
    • D. Henry David Thoreau
    • Discuss
    • 8. Which of these is a documented hoax virus?

    • Options
    • A. McDonalds screensaver
    • B. Alien.worm
    • C. Merry Xmas
    • D. Adolph
    • Discuss
    • 9. Against which team did Rahul Dravid made his ODI debut?

    • Options
    • A. Kenya
    • B. Pakistan
    • C. Sri Lanka
    • D. Australia
    • Discuss
    • 10. Who did The Rock wrestle in the main event at the 1999 edition of "Wrestlemania"?

    • Options
    • A. Stone Cold Steve Austin
    • B. Triple H
    • C. Mankind
    • D. Undertaker
    • Discuss


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