A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is __________
Fill in the blank(s) with correct word
8 minutes
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When the accelerating voltage in an X-ray tube is doubled, the minimum wavelength of the X-rays
A) is increased to twice the original value. B) is increased to four times the original value. C) is decreased to one-fourth the original value. D) is decreased to one-half the original value.
Which has more energy per photon?
A) red light B) blue light C) both the same
Most atoms are
a. electrically charged. b. uncharged but made up of electrically charged pieces. c. unitary things that cannot be broken up in any way. d. sources of easily-removed protons. e. sources of easily-removed neutrons.
The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R. What is the heat needed to heat 28.00 g of air from 20.00
to 85.00
?
A. 1,350 J B. 2,890 J C. 1,753 J D. 1,540 J E. 1,443 J