When an object is reflected in a plane mirror, the image is always

A. Virtual
B. Real
C. Inverted
D. None of these


A. Virtual

Physics & Space Science

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Astronomers can determine the interiors of main sequence stars by _____

a. studying their atmospheres b. creating stellar models c. detailed observations of the Sun d. using the Hertzsprung-Russell Stellar Model (HRSM) e. satellite observations of the closest stars

Physics & Space Science

Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?

A) The higher density of gas has a stronger force of gravity, and therefore the cloud collapses more quickly. B) The thickness of the dense cloud prevents a disk from forming. C) The higher gas density forms stars more efficiently, so all the gas is converted into stars before a disk can form. D) The force of gravity can pull the material into a more spherical shape. E) The more frequent collisions between particles randomize the particle orbits.

Physics & Space Science

A pencil partially submerged in a glass of water appears broken or offset because of

a. polarization. b. diffraction. c. interference. d. refraction.

Physics & Space Science

In order to double the average speed of the molecules in a given sample of gas, the temperature (measured in Kelvins) must

A) quadruple. B) reduce to one-fourth its original value. C) triple. D) double. E) reduce to one-half its original value.

Physics & Space Science