Among the modes of energy transfer in stars, _____ is the least efficient of all
A) conduction
B) convection
C) radiation
D) evaporation
A
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Escape speed from the Moon is
A) about the same as from Earth. B) much greater than from Earth. C) much less than from Earth.
Two sources of light illuminate a double slit simultaneously. One has wavelength 570 nm and the second has an unknown wavelength. The m = 5 bright fringe of the unknown wavelength overlaps the m = 4 bright fringe of the light of 570 nm wavelength
What is the unknown wavelength? A) 456 nm B) 326 nm C) 380 nm D) 713 nm
A parallel circuit consists of a 100 V DC power source, a 100 ? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).
If TiNi is deformed 5 % at a temperature above the martensite start temperature, and then the strain is fully recovered upon reduction of the stress to 0, this material is
(a) Super or pseudoelastic. (b) Anelastic. (c) Elastic. (d) Plastic.