Which of the following is NOT a property of a pulsar?
A) period of 1.34 seconds
B) over time, the period is gradually increasing
C) emissions only in the visible part of the spectrum
D) each pulse consisting of a 0.01 second burst of radiation
E) time interval between pulses is very uniform
C
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A radiation pyrometer is a device that uses radiant heat to measure the temperature of a surface. Assume that a pyrometer has a surface area of 5 cm^2 and is at a temperature of 20ºC when directed towards a furnace opening having a temperature of 1100ºC. Estimate the net rate of heat transfer towards the pyrometer if black body radiation is assumed.
What will be an ideal response?
The solar system is on an arm of the Milky Way galaxy.
Answer the following statement(s) true (T) or false (F)
Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) determine the distance to the star from its apparent brightness B) determine both the star's distance and luminosity from its apparent brightness C) calculate the star's surface temperature if we know either its luminosity or its distance D) calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity
In winter, light-colored clothes will keep you warmer than dark-colored clothes if
a. you are warmer than your surroundings. b. you are at the same temperature as your surroundings. c. you are cooler than your surroundings. d. you are standing in sunlight.