What happens to the atomic number (Z) and the mass number (A) when a nucleus emits a beta particle (electron)?
a. Z increases by 1; A is unchanged.
b. Z is unchanged; A is unchanged.
c. Z decreases by 2; A decreases by 4.
d. Z decreases by 1; A is unchanged.
a
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The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. Which one of the following numbers could be the principal quantum number n of the electron?
A) 0 B) 1 C) 2 D) 3 E) 4
A substance consisting of which molecule shown below should have a higher boiling point?
A) The molecule on the left, COImage, because it has a fewer number of atoms. B) The molecule on the right, ImageImageCl, because it has a greater number of atoms. C) The molecule on the left, COImage, because it is less symmetrical. D) The molecule on the right, ImageImageCl, because of electronegativity considerations.
A distant palm tree on a hot dry day that often appears to be reflected from water is
A) due to light refracted upward as it grazes the hot surface. B) the inverse of a mirage. C) evidence that light travels in straight lines.
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.