In which case does an electric field do positive work on a charged particle?
a. A negative charge moves opposite to the direction of the electric field.
b. A positive charge is moved to a point of higher potential energy.
c. A positive charge completes one circular path around a stationary positive charge.
d. A positive charge completes one elliptical path around a stationary positive charge.
a
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What statement below best describes the refraction of light?
a. The absorption of light as it travels through a dense, transparent material. b. The spreading out of white light according to wavelength. c. The change in direction of a light ray as it passes to a medium of different optical density. d. The change in direction of a ray of light as it reflects off a surface.
Regular atoms did not show up in the universe until when?
What will be an ideal response?
By locating the north celestial pole (NCP) in the sky, how can you determine your latitude?
A) The altitude of the NCP is your angular distance from the North Pole. B) The direction of the NCP is the angular distance from the North Pole. C) The direction of the NCP is the same as your latitude. D) The altitude of the NCP is the same as your distance from the North Pole. E) The altitude of the NCP is the same as your latitude.
The astrometric method looks for planets with careful measurements of a star's
A) position in the sky. B) brightness. C) velocity toward or away from us. D) distance from Earth.