Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles
a. Opposite signs.
b. The same sign.
c. Charges cannot be determined.
Ans: a. Opposite signs.
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The image of radio emission uses different colors to represent different levels of intensity. Which color represents the brightest radio emission? Which color represents the lowest levels of brightness?
What will be an ideal response?
One experiment that informs us that gravity bends lightbeams is
A) the bending of starlight as it nears Earth. B) experiments in which laser beams are shined onto the surface of the moon, and their bending is measured. C) the observed bending of light from stars as the light passes the sun. D) the observed bending of sunlight in Earth's gravitational field. E) laboratory experiments in which laser beams pass by massive amounts of iron.
A nanometer is
a. a unit of frequency. b. a unit of energy. c. a unit of mass. d. a unit of length. e. a unit of resolving power.
The natural radioactivity in a typical human body is closest to
A. 0.2 per hour B. 12 per hour C. 12 per minute D. 4000 per second