Radiocarbon dating is limited to the remains of plants and animals that died no longer than about
A) 100 years ago.
B) 5700 years ago.
C) 40,000 years ago.
D) 1,000,000 years ago.
Answer: B
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Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of
A) the Sun. B) the openings themselves. C) both of these D) neither of these
Show that the temperature distribution in a sphere of radius ro, made of a homogeneous material in which energy is released at a uniform rate per unit volume Gq, is
GIVEN
- A homogeneous sphere with energy generation
- Radius = ro
FIND
- Show that the temperature distribution is as shown above.
ASSUMPTIONS
- Steady state conditions persist
- The thermal conductivity of the sphere material is constant
- Conduction occurs in the radial direction only
SKETCH
A transformer is to be used to step down voltage from an alternating current source from 220 V to 110 V. If the primary has 120 turns, then the number of turns in the secondary is
A. 2. B. 720. C. 1320. D. 240. E. 60.
Which of the following are advantages offered by the thorium nuclear reactor?
A) operates at relatively low temperatures B) produces isotopes of short radioactive half-lives C) difficult to use for bomb making D) All of the above.