A photocathode has a work function of 2.4 eV. The photocathode is illuminated with monochromatic radiation whose photon energy is 3.4 eV. The maximum kinetic energy of the photoelectrons produced is closest to:
A) 1.6 × 10-19 J
B) 3.8 × 10-19 J
C) 4.4 × 10-19 J
D) 4.9 × 10-19 J
E) 5.4 × 10-19 J
A
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Answer the following statement(s) true (T) or false (F)
Creation science claims that scientific evidence can and does prove God made the universe. Select the statement which does not identify a legitimate objection to this claim. (Recall the hallmarks of science.)
A) If "God did it" is the explanation for everything, then final exams in astronomy would be very simple (all answers would be the same!), and science experiments would be very easy to explain, but we wouldn't learn much about the natural world. B) Science cannot prove (or disprove) the existence of a superpowerful, supernatural deity. C) The statement that "God did it" cannot be falsified by science, and therefore it is not a statement that science can test. D) Scientists are not allowed to believe in God.
Blowing sand in a sand dune, settles
A) on the windward slope of the dune. B) on the leeward slope of the dune. C) on surrounding mounds of vegetation. D) in the wind shadow of the leeward slope.
It is 39 trillion miles to the nearest star beyond the sun. Expressed in powers of ten, this is
A) 3.9 × 1013. B) 3.9 × 109. C) 3.9 × 1010. D) 3.9 × 1012.