Tides are caused because different parts of the earth's oceans are at different distances from the moon.
Indicate whether the statement is true or false
[Ques. 2] Which of these was NOT true about the limitations of Bohr's model?
a. The Bohr model failed to explain why electrons do not radiate.
b. The Bohr model could not predict spectral lines for elements which have more than one electron in the outer shell.
c. The Bohr model could not account for splitting of spectral lines.
d. The Bohr model could not account for the basic periodic nature of the elements.
e. The Bohr model could not explain why each shell held the number of electrons that it did.
[Ques. 3] Gravity acts over a limited distance range.
Indicate whether the statement is true or false
[Ques. 4] What are the two parts of a typical X-ray spectrum?
a. The electron stream and the proton stream.
b. Part A and Part B.
c. A continuous spectrum caused by slowing electrons and a set of discrete spikes from atomic emissions.
d. A continuous spectrum from atomic emission and a set of discrete spikes from slowing electrons.
e. A quantized spectrum of atomic energy and a continuous spectrum of photoelectric energy.
[Ques. 5] As you go from a point where a gravitational field is strong to a point where the gravitational field gets weaker, the gravitational field lines get farther apart.
Indicate whether the statement is true or false
[Ques. 6] What is needed, in addition to the parts of the Bohr model used to calculate the energies of a hydrogen atom, to understand the periodicity of the elements?
a. An understanding of the photoelectric effect.
b. The calculated radii of the orbits in which electrons move.
c. The principle that alkali metals (in the column of the Periodic Table containing lithium, sodium, potassium, etc.) have their outer shell of electrons filled.
d. The principle that atoms have shells that each hold a certain number of electrons, with filled shells being the most stable.
e. The principle that the noble gas elements accept electrons easily from other atoms.
[Ques. 7] The direction of a field line at a point in space shows the direction of the force that would act on a body placed at the point.
Indicate whether the statement is true or false
[Ques. 8] This figure shows the electron shell structure for hydrogen, helium, lithium, and sodium. How many electrons would you expect in the second shell of neon? Refer to the periodic table on the inside front cover of your textbook for help.
a. 7
b. 2
c. 8
d. 10
e. 16
[Ques. 9] Just above the surface of the earth, the direction of the gravitational field is away from the earth.
Indicate whether the statement is true or false
[Ques. 10] Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom.
b. the specific jumps downward in energy that an electron has available in an unexcited atom.
c. the specific jumps upward in energy that an electron has available in an unexcited atom.
d. the specific jumps upward in energy that an electron has available in an excited atom.
e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.
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