A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface of the lake. Which statement best describes what happens to the volume of that piece of iron?
A) Its volume increases slightly.
B) Its volume decreases slightly.
C) There has been no change in the volume of the iron.
D) Its volume becomes 1/21 what it was at the surface.
E) Its volume becomes 21 times greater than at the surface.
B
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A) converging B) diverging C) Either type would work equally well.
The half-life of 3H is 12 years. About how long does it take for 127/128 of a sample of that radionuclide to decay?
a. 7 years b. 11.9 years c. 12.1 years d. 84 years
Which statement is correct?
A. Only radial-velocity and transit methods reveal the radius of the planet. B. Only direct imaging and gravitational lensing methods reveal the mass of the planet. C. Only radial-velocity and gravitational lensing methods reveal the mass of the planet. D. Only direct imaging and transit methods reveal the radius of the planet. E. None of these choices are correct.
A gas in a furnace has an extinction coefficient of 0.01m^-1 and a mean beam length of 10 m. What is the transmissivity of radiation through the gas?
What will be an ideal response?