The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.6022 × 10-19 J)
A) 1.812 eV B) 1.537 eV C) 3.572 eV D) 1.786 eV E) 1.646 eV
D
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Which statement is true when comparing Saturn to Jupiter? a. Saturn has rings and Jupiter does not
b. Saturn has stronger winds than Jupiter. c. Saturn is closer to the Sun than Jupiter. d. Saturn is composed of more hydrogen and helium than Jupiter. e. Saturn has a more distinct belt-zones than Jupiter.
Which of these is NOT typical of a condensing protostar?
A) magnetic fields producing polar flows B) dusty disks around their equators C) Herbig-Haro objects projecting a light year out in space D) fusion of helium into carbon in their cores E) more infrared than visible light given off from the cocoon of dust around the star
A 60.0-Hz ac generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The impedance is
a. 3.77 ?. b. 9.26 ?. c. 10.0 ?. d. 10.7 ?. e. 13.8 ?.
What happens when the air is saturated?
A) The condensation rate equals the evaporation rate. B) The air is at its water vapor capacity. C) Relative humidity is 100%. D) The air temperature equals the dew point temperature. E) all of the above