If 480 C pass through a 4.0-W resistor in 10 min, what is the potential difference across the resistor?
a. 3.6 V
b. 2.8 V
c. 2.4 V
d. 3.2 V
e. 5.0 V
D
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The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction. b. neutron stars of more than 3 solar masses are not stable. c. white dwarfs more massive than 1.4 solar masses are not stable. d. stars cannot travel through space too fast e. stars with a mass less than 0.5 solar masses will not go through helium flash.
Approximately how long does energy take to travel from the core to the surface of the Sun?
A. 10 billion years B. 16 million years C. a few seconds D. a few minutes E. a thousand years
After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: Electrons moving upward feel a magnetic force in the
northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the east B) toward the northeast C) toward the southwest D) toward the southeast E) toward the west
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