The physicist responsible for explaining the wave nature of light was
A) Sir Isaac Newton.
B) Michael Faraday.
C) Heinrich Hertz.
D) James Clerk Maxwell.
E) Gustav Kirchhoff
D
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Which is NOT true?
A. A star that appears brighter than another is always closer. B. A blue Main Sequence star has a higher luminosity than a red main sequence star C. More massive Main Sequence stars are always both hotter and brighter than less massive Main Sequence stars D. A B-type Main Sequence star that appears 100 times brighter than another B type Main Sequence star is 10 times closer E. The spectrum of a star allows us to estimate its temperature
Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 13. How do they compare in observed brightness?
A) Star Y is 10,000 times brighter than star X. B) Star X is 10,000 times brighter than star Y. C) Star Y is 10 times brighter than star X. D) Star X is 10 times brighter than star Y.
How much kinetic energy must a deuterium ion (charge = 1.6 × 10^–19 C) have to approach within 1.7 × 10^?14 m of another deuterium ion? (ke = 8.99 × 10^9 N·m2/C2 and 1 keV = 1.6 × 10^–16 J)
a. 50 keV b. 110 keV c. 10 keV d. 80 keV e. 140 keV
A 100-m long transmission cable is suspended between two towers. If the mass density is 2.01 kg/m and the tension in the cable is 3.00 × 10^4 N, what is the speed of transverse waves on the cable?
a. 60 m/s b. 122 m/s c. 244 m/s d. 310 m/s e. 1500 m/s