Q&A Hero

Physic

Q: Which of the following devices use lasers? a. DVD players b. fiber optics communication systems c. photocopiers d. UPC price scanners
Q: In which of the following energy level transitions for a hydrogen atom is a photon emitted? a. n=1 to n= 2 b. n=3 to n= 2 c. n=2 to n= 1 d. n=1 to n= 4 e. n=4 to n= 3
Q: According to the Pauli Exclusion Principle for n = 4, the occupation limit of electrons is:a. 4 b. 8 c. 16d. 32
Q: The red line in the helium spectrum is closer to orange than the red line in the hydrogen spectrum, indicating that it has a higher frequency. Therefore, the photons of red light emitted by helium have __________ energy than those emitted by hydrogen.a. lower b. higher c. the samed. more ionization
Q: A population inversion is a circumstance within a laser system in which there are ______ atoms with their electrons in an upper excited state than in a specific preferred lower state.a. more b. fewer c. the same amountd. ionized
Q: The Balmer series of emission lines from hydrogen lie in the ________ part of the EM spectrum.a. near infrared b. infrared c. visibled. ultraviolet
Q: The energy of a photon that ionizes a hydrogen atom from the ground state will be _________ the energy of a photon that ionizes a different hydrogen atom from the first excited state (n - 2).a. larger than b. smaller than c. equal tod. twice
Q: How small an object can a scanning tunneling microscope "see?" a. about the size of a mushroom spore b. about the size of a living cell c. as small as a single atom d. as small as the nucleus of an atom
Q: The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is a. 1.5 eV b. 1.9 eV c. 3.4 eV d. 10.2 eV e. 13.6 eV
Q: The ionization energy of hydrogen is a. 1.5 eV b. 1.9 eV c. 3.4 eV d. 10.2 eV e. 13.6 eV
Q: The energy of the most energetically possible photon emitted isa. 1.5 eVb. 1.9 eVc. 3.4 eVd. 10.2 eVe. 13.6 eV
Q: NARRBEGIN: Energy level hydrogenThe energy level diagram for hydrogenNARRENDThe energy of a photon emitted in a transition from then = 3 state to then = 2 state isa. 1.5 eVb. 1.9 eVc. 3.4 eVd. 10.2 eVe. 13.6 eV
Q: The aurora borealis (northern lights) are caused bya. sunlight reflecting from polar iceb. emissions from atoms and molecules in the upper atmosphere excited by electrons from the sunc. thunderstormsd. an unknown process
Q: Lasers are useda. to produce hologramsb. in surgeryc. to measure distances between objects accuratelyd. in DVD and compact disc playerse. all of the above
Q: In a laser a. light is amplified by stimulated emission of radiation b. the emitted light is monochromatic c. the emitted light is coherent d. there is a population inversion of electrons in atoms e. all of the above
Q: The continuous part of an x ray spectrum of an atom occurs because a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons
Q: The characteristic peaks in an x ray spectrum of an atom occur because a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons
Q: When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons a. increases b. decreases c. stays the same d. becomes more quantized e. becomes less quantized
Q: When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons a. increases b. decreases c. stays the same d. becomes more quantized e. becomes less quantized
Q: The person who developed the concept of a wave function was a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
Q: The person who expounded the uncertainty principle was a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg.
Q: The spectra of different elements can be distinguished becausea. they have the same spectral lines, but the lines are of different intensitiesb. they have spectral lines in different positionsc. every element has one unique spectral lined. none of the above
Q: What is meant by a line spectrum?a. a spectrum which is straightb. a spectrum made of bright lines in certain places, separated by dark gapsc. a spectrum made by a hot filament stretched into a straight lined. none of the above
Q: The person who first explained the discrete hydrogen atom spectrum was a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
Q: Which of the following devices make use of the photoelectric effect?a. digital camerasb. photocopiersc. laser printersd. solar cellse. all of the above
Q: The person who first explained the photoelectric effect was a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
Q: What quantities are plotted on a blackbody radiation curve?a. total radiated energy vs. temperatureb. radiation intensity vs. wavelengthc. wavelength of peak emission vs. temperatured. none of the above
Q: The person who first explained the blackbody spectrum was a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg
Q: The quantity that is quantized in the oscillating atoms of a blackbody is a. angular momentum b. energy c. the emission spectrum d. the absorption spectrum e. the wave function
Q: What is coherent light?a. light of a single wavelengthb. light that is all in phasec. light that is polarized in one directiond. none of the above
Q: Which of these is notinvolved in the operation of lasers?a. stimulated emission b. population inversion c. metastable stated. blackbody radiation
Q: A three dimensional image made using a laser is a(n) a. emission spectrum b. absorption spectrum c. wave function d. hologram e. photoelectric effect
Q: Electron diffraction shows a. that electrons behave like waves b. the photoelectric effect c. characteristic x ray spectra d. that electrons in atoms have only certain allowed energies
Q: If the speed of an electron increases, its de Broglie wavelengtha. increases b. decreases c. stays the samed. may increase or decrease
Q: The highest energy level in an atom is its a. ionization level b. emission level c. absorption level d. photon level e. ground state
Q: The lowest energy level in an atom is its a. ionization level b. emission level c. absorption level d. photon level e. ground state
Q: What is "excluded" by the Pauli exclusion principle?a. certain values of angular momentumb. precise values of both position and momentumc. electrons in the same quantum stated. none of the above
Q: The fact that a particle cannot be precisely localized is the a. photoelectric effect b. uncertainty principle c. principle of a hologram d. principle of a laser e. reason why photons are emitted
Q: In the Bohr model of the hydrogen atom a. energy is quantized b. the electron's angular momentum is quantized c. the emission spectrum is quantized d. the absorption spectrum is quantized. e. all of the above
Q: An atom can be excited into a higher energy state by a. emitting a photon b. absorbing a photon c. undergoing the photoelectric effect d. decreasing its de Broglie wavelength e. the uncertainty principle
Q: An excited atom can lose energy by a. emitting a photon b. absorbing a photon c. undergoing the photoelectric effect d. increasing its de Broglie wavelength e. the uncertainty principle
Q: The energy associated with a photon of blue light is ________________ the energy associated with a photon of red light.a. greater than b. less than c. equal tod. unrelated to
Q: What is the symbol used for Planck's constant?a. p b. c. hd. none of the above
Q: What does it mean for something to be "quantized?" a. It can have only certain discrete values. b. It can have only integer values. c. It can have values only between certain limits. d. none of the above
Q: A quantum of electromagnetic radiation is a a. wave function b. photon c. de Broglie wave d. laser e. hologram
Q: Electrons emitted when light strikes the surface of a metal is a. photon emission b. photon absorption c. the photoelectric effect d. a laser e. an emission spectrum
Q: When the speed of an electron is increased the de Broglie wavelength is decreased.
Q: The fact that two electrons cannot occupy the same quantum state at the same time is the Heisenberg exclusion principle.
Q: The aurora borealisis an example of atoms and molecules in the atmosphere absorbing photons and exciting the atoms and molecules to emit spectra.
Q: If an electron acquires more than the ionization energy, the electron will return to the ground state.
Q: The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is 13.6 eV.
Q: The ionization energy of hydrogen is 13.6 eV.
Q: The energy of the most energetically possible photon emitted is 10.2 eV.
Q: NARRBEGIN: Energy level hydrogenThe energy level diagram for hydrogenNARRENDThe energy of a photon emitted in a transition from then = 3 state to then = 2 state is 1.9 eV.
Q: UPC price scanners at supermarket checkouts use laser holography to read the bar codes because the packages are three dimensional.
Q: A laser can be used for very accurate measurements of distances between objects.
Q: Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect.
Q: A laser emits monochromatic and coherent light.
Q: At any instant in time, it is possible to specify simultaneously the position and the momentum of a particle to arbitrarily high precision.
Q: The chemical composition of stars can be determined from lines in their spectra.
Q: The characteristic peaks in an x ray spectrum of an atom occur because of rapid deceleration of the bombarding electrons.
Q: Characteristic peaks occur in an x ray spectrum of an atom because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons.
Q: Photocopiers make use of the photoelectric effect.
Q: When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons increases.
Q: As the intensity of light is increased in a photoelectric effect experiment, the energy of the emitted electrons increases.
Q: Two different gases may have the same emission line spectrum.
Q: There is a direct correlation between the absorption and emission spectra of a particular gas.
Q: Perfect absorbers of electromagnetic radiation are also perfect emitters.
Q: The energy of an oscillating atom in a blackbody can be a any value within a certain limited range.
Q: The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature increases.
Q: The peak of the radiation curve of a blackbody moves upward toward higher intensity as its temperature increases.
Q: In a blackbody, the energy of the oscillating atoms is quantized.
Q: A 100 eV electron and a 100 eV proton have equal de Broglie wavelengths.
Q: An x ray can be emitted when an electron undergoes an energy level transition.
Q: The highest energy level in an atom corresponds ton = 1.
Q: The ground state is the lowest energy level in an atom.
Q: The element helium was discovered by studying the sun's spectrum.
Q: The early Solvay Conferences had a great effect upon the development of quantum mechanics.
Q: Electrons in atoms move about the nucleus in well defined circular orbits.
Q: The uncertainty principle states that a particle cannot be precisely localized.
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