A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2
b. 1/4
c. ?2
d. 4
e. ?1/4
e
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Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?
A) New telescopes incorporate new technology to increase their efficiency. B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths. C) Photons of different energy have different wavelengths, some of which are not accessible from Earth's surface and require different collection strategies. D) Light pollution is worse at radio wavelengths than visible wavelengths. E) Astronomers and engineers enjoy the challenge of making new telescope designs.
A heavy weight is supported by two cables that exert tensions of magnitude 
and 
. Which statement is correct?
?
?
A.
= 
.B.
= 
.C.
>.D.
<.E.
The Higgs field, if it is discovered, will explain the origin of
A) gravity. B) the big bang. C) rest mass. D) electric charge. E) photons.
When white light disperses as it passes through a prism, which of the following colors moves at the highest speed in the prism?
a. yellow c. blue b. red d. green