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When electrons are sent one at a time towards a pair of closely spaced slits and detected using a screen placed beyond the slits, they gradually build up a pattern like the one shown in the figure below.    Image Description a series of images showing dots on a screen. The first image appears to show random dots, but as they progress, and there are more dots, it is clear that the dots are grouped into vertical stripes separated by regions where there are almost no dots. Attributions Images Belsazar. Double-slit experiment results Tanamura 2 [photograph]. (CC BY-SA 3.0). Via Wikimedia Commons.

The next two questions deal with a stick of dynamite exploding.

Below is a dot density diagram showing the 2p orbital. In this diagram what do the light areas represent?     

An air conditioner is normally placed in a window so the hot air from the back blows outside. What would happen if the air conditioner were placed in the middle of a closed room and turned on?

If they placed a detector at the slits in the experiment described above to measure which slit each electron went through, what would happen?

In another important experiment used to determine the nature of atoms, a gas like hydrogen, neon or mercury is excited by sparking it with electricity. The light emitted is separated out into individual colors using a prism or diffraction grating and a few lines of colored light are seen. How do atoms produce these lines of light?

When you compare the mass of the products to the mass of the reactants in a fission reaction, what do you find? (Note the question is asking about mass, not mass number.)

The next two questions deal with this situation: In one early experiment that helped determine the structure of matter, alpha particles were shot at a thin sheet of gold foil. The particles were detected on a screen that could be moved about the room.

Which of these is a correct comparison of metals and semi-conductors?

Which of the cars has the largest kinetic energy at time 4?