Nuclear fission plants generate no pollution
What will be an ideal response?
We know that there is no air pollution or water pollution directly, as there would
be from a coal-fired plant, for example, but one would consider the high- and low-level
radioactive waste to be a pollutant. So it would be a misstatement to say there was no
pollution.
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You observe a star similar to our own Sun in size and mass. This star moves slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet. What can you conclude about the orbiting planet?
A) The planet must be closer to the star than Earth is to the Sun. B) The planet must have a mass about the same as the mass of Jupiter. C) The planet must be farther from the star than Neptune is from the Sun. D) You do not have enough information to say anything at all about the planet.
The total number of galaxies in our observable universe is
A) about ten million B) about a hundred billion C) infinite D) a few trillion
Without greenhouse gases, Earth's surface would be frozen over
Indicate whether the statement is true or false
The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from this wire?
A) 6 ?T B) 2 ?T C) 4 ?T D) 10 ?T E) 8 ?T