At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?
a. 50 nm
b. 500 nm
c. 300 nm
d. 1.8 × 10^11 nm
e. 180 nm
a
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What do we mean when we say that a nucleus undergoes radioactive decay?
a. The mass of the nucleus is converted into high-energy X rays and gamma rays. b. The nucleus splits into two equal size pieces. c. The nucleus emits radio waves. d. The number of protons or neutrons (or both) in the nucleus changes.
What is the shape of the event horizon?
a. circle b. line c. sphere d. square
The SI unit of length, the meter, is currently defined
A) as 10-7 of the distance from the North Pole to the equator along a meridian running through Paris. B) as the length of the path traveled by light in a vacuum during 1/299792485 s. C) by the President's foot. D) as the distance between two marks on a metal bar make of a platinum-iridium alloy kept at the National Bureau of Standards. E) 1,553,164.1 wavelengths of red cadmium light in dry air at 25°C.
Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?
A) 15. V B) 30. V C) 0.15 kV D) 30. kV E) impossible to calculate from the information given