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
[Ques. 2] 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.
[Ques. 3] 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.
[Ques. 4] 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.
[Ques. 5] 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.
[Ques. 6] The person who developed the concept of a wave function was
a. Max Planck.
b. Albert Einstein.
c. Neils Bohr.
d. Erwin Schrdinger.
e. Werner Heisenberg.
[Ques. 7] The person who expounded the uncertainty principle was
a. Max Planck.
b. Albert Einstein.
c. Neils Bohr.
d. Erwin Schrdinger.
e. Werner Heisenberg.
[Ques. 8] The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities.
b. they have spectral lines in different positions.
c. every element has one unique spectral line.
d. none of the above
[Ques. 9] What is meant by a line spectrum?
a. a spectrum which is straight
b. a spectrum made of bright lines in certain places, separated by dark gaps
c. a spectrum made by a hot filament stretched into a straight line
d. none of the above
[Ques. 10] The person who first explained the discrete hydrogen atom spectrum was
a. Max Planck.
b. Albert Einstein.
c. Neils Bohr.
d. Erwin Schrdinger.
e. Werner Heisenberg.
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