Which of these colors of light has photons of greatest energy?
a. Green
b. Red
c. Blue
d. Yellow
c
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Wien's Law: Two identical metal bars are heated up until they are both glowing. One of them is "red hot" and the other is "blue hot." Which one is hotter, the one that glows red or the one that glows blue?
A. the red one B. the blue one C. We cannot tell without knowing more about the two bars.
Heat energy is measured in units of
A) degrees. B) joules. C) calories. D) both joules and calories.
A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10^?4 cal/s/cm/°C
a. 62 b. 74 c. 230 d. 160 e. 12
The thermal neutron cross section of a proton is 0.33 bn. If this cross-section were to represent the circular cross-sectional area of the proton presented to the neutron beam, what would be the radius of the proton?
A) 1.2 x 10-15 m B) 1.6 x 10-15 m C) 3.2 x 10-15 m D) 4.1 x 10-15 m E) 5.2 x 10-15 m