Electromagnetic radiation of wavelength 3.5 meters is which type?
A) AM-radio
B) microwaves
C) FM-radio
D) visible
E) ultraviolet
C
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Estimate the heat loss per unit area from a blacktop highway at 110ºC if the air is still and 28ºC.
What will be an ideal response?
Quasar spectra often show many absorption lines that all appear to be as a result of the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows; it remains perhaps the greatest mystery about quasars.
Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons. (G = 6.67 × 10-11 N ? m2/kg2)
Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The mass of Ekapluto is closest to A) 1.0 × 1022 kg. B) 3.0 × 1022 kg. C) 1.0 × 1023 kg. D) 3.0 × 1023 kg. E) 1.0 × 1024 kg.
When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? (The bulk modulus of ice is 2.0 × 10^9 Pa, and 1 atm = 1.0 × 10^5 Pa.)
a. 18 atm c. 1080 atm b. 270 atm d. 1800 atm