12. Which of the following statements about electrons refer to the Bohr Model of an atom?
A. move at a very high velocity around the nucleus
B. exist at different energy levels in orbit around the nucleus
C. can move between energy levels when they gain or lose energy
D. all of the above

13.
The following are rules/principles used in arranging the electrons around the
nucleus of an atom EXCEPT
A. Hund's Rule
B. Aufbau Principle
C. Pauli Exclusion Principle
D. Heisenberg's Uncertainty Principle

14. If a neutral atom has 18 electrons, what is the highest principal energy level
that its outermost electrons will occupy?
A. 1
B. 2.
C.3
D. 4​

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

This punnett square shows the cross between two pants. one parent has round seeds (rr). and the other parent has wrinkled seeds (rr) which best describes their offspring as shown in this cross?