Modern Physics Theories Quiz: Trivia!

38 Questions | Total Attempts: 285

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Modern Physics Theories Quiz: Trivia!

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Questions and Answers
  • 1. 
    When light is directed at a metal surface, the energies of the emitted electrons:
    • A. 

      Vary with the intensity of the light

    • B. 

      Vary with the frequency of the light

    • C. 

      Vary with the speed of the light

    • D. 

      Are random

  • 2. 
    The photoelectric effect can be understood on the basis of:
    • A. 

      The electromagnetic theory of light

    • B. 

      The interference of light waves

    • C. 

      The special theory of relativity

    • D. 

      None of these

  • 3. 
    In a vacuum, all photons have the same_____________
    • A. 

      Frequency

    • B. 

      Wavelength

    • C. 

      Energy

    • D. 

      Speed

  • 4. 
    The mass of a photon:
    • A. 

      Is 0

    • B. 

      Is the same as that of an electron

    • C. 

      Depends on its frequency

    • D. 

      Is the size of the x-rays emitted

  • 5. 
    The rate at which an object emits electromagnetic energy does not depend on its:
    • A. 

      Surface area

    • B. 

      Mass

    • C. 

      Temperature

    • D. 

      Ability to absorb radiation

  • 6. 
    When the speed of the electrons that strike a metal surface is increased, the result is an increase in
    • A. 

      The number of x-rays emitted

    • B. 

      The frequency of the x-rays emitted

    • C. 

      The speed of the x-rays emitted

    • D. 

      The size of the x-rays emitted

  • 7. 
    A phenomenon that cannot be understood with the help of the quantum theory of light is 
    • A. 

      The photoelectric effect

    • B. 

      X-ray production

    • C. 

      The spectrum of an element

    • D. 

      Interference of light

  • 8. 
    According to the theories of modern physics, light
    • A. 

      Is exclusively a wave phenomenon

    • B. 

      Is exclusively a particle phenomenon

    • C. 

      Combines wave and particle properties

    • D. 

      Has neither wave nor particle properties

  • 9. 
    According to the theories of modern physics, 
    • A. 

      Only stationary particles exhibit wave behavior

    • B. 

      Only moving particles exhibit wave behavior

    • C. 

      Only charged particles exhibit wave behavior

    • D. 

      All particles exhibit wave behavior

  • 10. 
    The speed of the wave packet that corresponds to a moving particle is 
    • A. 

      Less than the particle's speed

    • B. 

      Equal to the particle's speed

    • C. 

      More than the particle's speed

    • D. 

      Any of these, depending on the circumstances

  • 11. 
    De Broglie waves can be regarded as waves of:
    • A. 

      Pressure

    • B. 

      Probability

    • C. 

      Electric charge

    • D. 

      Momentum

  • 12. 
    The description of a moving body in terms of matter waves is legitimate because:
    • A. 

      It is based upon common sense

    • B. 

      Matter waves have actually been seen

    • C. 

      The analogy with electromagnetic waves is plausible

    • D. 

      Theory and experimental agree

  • 13. 
    The narrower the wave packet of a particle is:
    • A. 

      The shorter its wavelength

    • B. 

      The more precisely its position can be established

    • C. 

      The more precisely its momentum can be established

    • D. 

      The more precisely its energy can be established

  • 14. 
    According to the uncertainty principle, it is impossible to precisely determine at the same time a particle's 
    • A. 

      Position and change

    • B. 

      Position and momentum

    • C. 

      Momentum and energy

    • D. 

      Charge and mass

  • 15. 
    If Planck's constant were larger than it is, 
    • A. 

      Moving bodies would have shorter wavelengths

    • B. 

      Moving bodies would have higher energies

    • C. 

      Moving bodies would have greater charges

    • D. 

      The uncertainity principle would be significant on a larger scale

  • 16. 
    THe emission spectrum produced by the excited atoms of an element contains frequencies that are 
    • A. 

      The same for all elements

    • B. 

      Characteristic of the particular element

    • C. 

      Evenly distributed throughout the entire visible spectrum

    • D. 

      Different from the frequencies in its absorption spectrum

  • 17. 
    A neon sign does not produce
    • A. 

      A line spectrum

    • B. 

      An emission spectrum

    • C. 

      An absorption spectrum

    • D. 

      Photons

  • 18. 
    Most stars are hot objects surrounded by a cooler atmosphere. The spectrum of such a star is a
    • A. 

      Continuous band of light

    • B. 

      Band of light crossed by brighter lines

    • C. 

      Band of light crossed by dark lines

    • D. 

      Series of bright lines

  • 19. 
    The classical model of the hydrogen atom falls because
    • A. 

      An accelerated electron radiates electromagnetic waves

    • B. 

      A moving electron has more mass than an electron at rest

    • C. 

      A moving electron has more charge than an electron at rest

    • D. 

      The attractive force of the nucleus is not enough to keep an electron in orbit around it

  • 20. 
    An electron can revolve in an orbit around an atomic nucleus without radiating energy provided that the orbit
    • A. 

      Is far enough away from the nucleus

    • B. 

      Is less than a de Broglie wavelength in circumference

    • C. 

      Is a whole number of de Broglie wavelengths in circumference

    • D. 

      Is a perfect circle

  • 21. 
    According to the Bohr model of the atom, an electron in the ground state
    • A. 

      Radiates electromagnetic energy continuously

    • B. 

      Emits only spectral lines

    • C. 

      Remains there forever

    • D. 

      Can jump to another orbit if given enough energy

  • 22. 
    In the Bohr model of the atom, the electrons revolve around the nucleus of an atom so as to 
    • A. 

      Emit spectral lines

    • B. 

      Produce x-rays

    • C. 

      Form energy levels that depend upon their speeds only

    • D. 

      Keep from falling into the nucleus

  • 23. 
    A hydrogen atom is said to be in its ground state when its electron 
    • A. 

      Is at rest

    • B. 

      Is inside the nucleus

    • C. 

      Is in its lowest energy level

    • D. 

      Has escaped from the atom

  • 24. 
    An atom emits a photon when one of its orbital electrons.
    • A. 

      Jumps from a higher concentration to a lower energy level

    • B. 

      Jumps from a lower to a higher energy level

    • C. 

      Is removed by the photoelectric effect

    • D. 

      Is struck by an x-ray

  • 25. 
    The energy difference between adjacent energy levels in the hydrogen atom.
    • A. 

      Is smaller for small quantum numbers

    • B. 

      Is the same for all quantum numbers

    • C. 

      Is larger for small quantum numbers

    • D. 

      Has no regularity