What methodology do astronomers use to map the inside of the Sun?
a. coronagraphy
b. magnetic field mapping
c. helioseismology
d. chromography
e. heliogeology
c
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When ice water at 0°C is heated
A) thermal expansion occurs. B) thermal contraction occurs. C) both occur until 4°C is reached
A flashlight draws 0.133 A from a 3.0 volt battery pack. In 2.0 minutes:
(a) how much charge flows from the battery? (b) how much energy was supplied by the battery? (c) how many electrons passed any point in the circuit every second?
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. How much tritium will be left after 30 years?
a. 0.20 kg b. 1.8 kg c. 0.18 kg d. 1.7 kg e. 4.1 kg
Which of the following is not an advantage of the Hubble Space Telescope over ground-based telescopes?
A) It never has to close because of cloudy skies. B) Stars do not twinkle when observed from space. C) It is closer to the stars. D) It can observe infrared and ultraviolet light, as well as visible light.