What is an opaque surface?
What will be an ideal response?
An opaque surface is one which does not allow transmission of radiation
through the body. Thus, an opaque surface is really describing an opaque body.
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If the back of a person's eye is too close to the lens, this person is suffering from
A) nearsightedness. B) spherical aberration. C) astigmatism. D) chromatic aberration. E) farsightedness.
Astronomers generally can measure a star's mass if only it is a member of a binary star system. What characteristics of the stars must we know to measure the masses of the stars in a binary system?
A) their spectral types and their distance from Earth B) their absolute magnitudes and their luminosities C) their orbital period and average orbital distance D) their luminosities and distance from Earth
Express the result of the following calculation, to the proper number of significant figures: 8.4 + 4240
What will be an ideal response?
Ohm's Law: For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?
A. power B. resistivity C. 1/(resistivity) D. resistance E. 1/(resistance)