The focal length of a lens is 5 m. What is the refractive power of this lens in diopters?
A) 0.1 diopters
B) 0.2 diopters
C) 0.3 diopters
D) 0.4 diopters
E) 0.5 diopters
B
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How do astronomers estimate the approximate age of the Universe?
A. The age of the Universe is equal to 1/H. B. The age of the Universe is approximately the age of our Sun. C. The age of the Universe is equal to the Hubble constant (H). D. They measure the distance to the cosmic horizon and divide by the speed of light.
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
A. 5.0 N B. 4.4 N C. 3.8 N D. 5.7 N E. 0.60 N
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
a. absorb different quantities of thermal energy from their surroundings in equal time intervals. b. have different masses. c. have different volumes. d. have any of the properties listed above. e. have any of the properties listed above and one of them is contact with a third body at a different temperature.
In the He-Ne laser, the lasing transition goes from the 20.66 eV state in Ne to a lower state. The wavelength of the laser photons is 633.0 nm. What is the lower state of the lasing transition?
A. the He ground state B. the Ne ground state C. the 20.61 eV excited stated of He D. the 18.70 eV excited state of Ne E. the 4.660 eV excited state of Ne