Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows
A) chromatic aberration to be reduced.
B) more light to be gathered.
C) greater magnification.
D) X-rays to be focused.
E) effects of atmospheric turbulence to be reduced.
A
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Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. their diameters are so large and the energy they receive is not electromagnetic radiation. e. None of the other choices are correct.
All know forms of life on Earth use _______ as a medium for chemical reactions
a. gaseous helium b. gaseous helium c. frozen carbon dioxide d. liquid water e. frozen water
Dissociation is the process in which
A) the bonds between atoms in a molecule are broken. B) a molecule goes from the solid phase to the gas phase. C) the bonds between electrons around an atomic nucleus are broken. D) an element changes into another form. E) an electron is shared between atomic nuclei.
A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N. b. 201 N. c. 211 N. d. 553 N. e. 580 N.