The ultimate truth of any radiometric date depends on the
A) size of the given sample.
B) chemical composition of the sample being tested.
C) precision and accuracy of the lab techniques.
D) reset date of the sample.
Answer: C
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Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is produced on a screen that is 1.5 m from the slit. What is the width of the central maximum?
A) 0.34 cm B) 0.46 m C) 0.68 cm D) 0.92 cm E) 1.2 cm
A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark?
a. 0.30 N b. 0.45 N c. 0.60 N d. 0.90 N e. 1.0 N
A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant?
a. 9.5 N b. 3.0 N c. 8.1 N d. 5.6 N e. 4.7 N
Which is NOT true?
A. A star that appears brighter than another is always closer. B. A blue Main Sequence star has a higher luminosity than a red main sequence star C. More massive Main Sequence stars are always both hotter and brighter than less massive Main Sequence stars D. A B-type Main Sequence star that appears 100 times brighter than another B type Main Sequence star is 10 times closer E. The spectrum of a star allows us to estimate its temperature