Process of Science: Name a testable hypothesis from nebular theory that was proven true in observations of extrasolar planets. Does this mean the theory is complete?
What will be an ideal response?
One consequence of nebular theory is that it might not be unusual to have planets form around stars. The many discovered planets have borne this out. The theory cannot be complete without many more observations.
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Process of Science: In the discovery of quasars, the radio source 3C273 was found to have strong emission lines at wavelengths that did not correspond to any known element on Earth
Suppose a scientist postulated that they had discovered a new element that only existed in these powerful radio sources. How would you test this?
A feature of the nuclear reactor at Chernobyl that contributed to the magnitude of the accident there was that
A. plutonium could build up quickly in the reactor. B. the reactor did not have control rods. C. water was used only as a coolant, not a moderator. D. the uranium fuel was more highly enriched.
You see a positively charged helium ion in space, and it is at rest with respect to your spacecraft. Since you are studying for the final exam, you decide to experiment. You slowly push the N pole of a bar magnet closer to the helium ion. What happens to the helium ion?
A. It depends on whether it is a positive ion or a negative ion B. It experiences a magnetic force and moves off C. Nothing happens, because the ion is not moving
The coefficient of linear expansion of lead is 29 × 10-6 K-1. What change in temperature will cause a 10-m long lead bar to change in length by 3.0 mm?
A) 5.0 K B) 10 K C) 15 K D) 20 K E) 25 K