The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood.
B) the ax-handle is about 18,000 years old.
C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today.
D) the ax-handle is about 12,000 years old.
E) the ax-handle is about 48,000 years old.
B
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A chunk of metal has a mass of 1 kg on Earth. If the same chunk were on the Moon its mass would be
A) less. B) the same. C) more.
The interstellar medium is made of ______________
a. gas b. dust c. gas and dust d. None of these choices are correct.
At what distance could one theoretically distinguish two automobile headlights separated by 1.5 meters? Assume a pupil diameter of 0.50 cm and yellow headlights seen at the wavelength 5.0 × 10?7 m. Assume eye fluid has an average n = 1.33.
A. 6.0 km B. 12 km C. 9.0 km D. 3.0 km E. 16 km
Red-colored diode lasers for pointers and surveying are made from pnjunctions of the compound semiconductor GaAs that has an energy gap of 1.42 eV. What is the wavelength of the light from a GaAs laser?
What will be an ideal response?