How does the speed (in a vacuum) of a high-frequency electromagnetic wave compare with a low-frequency electromagnetic wave?
A) the lower-frequency wave has the higher speed because speed is inversely related to frequency
B) the two waves have the same speed because the speed of light is constant
C) the lower-frequency wave has the higher speed because it has the longest wavelength
D) the higher-frequency wave has the higher speed
B
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
Study this H-R diagram. What is the spectral type of the star Sirius? (The red arrow helps you locate Sirius on the diagram.)
A) A B) 102 C) main sequence D) blue
This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. Which stage lasts the longest?
A) Stage i B) Stage iii C) Stage iv D) Stage viii
Assuming the length remains the same, calculate the period of the same simple pendulum on the surface of the Moon? [Note: The acceleration (g) due to gravity on the Moon is one-sixth of that on Earth.]