Although it is highly unlikely to happen, suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought.
B) It would not have any effect on our estimate of the distance to the Andromeda Galaxy.
C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought.
D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.
A) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought.
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Double-Slit Interference: A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits. If there are 5.0 bright fringes/cm on the screen, what is the wavelength of the monochromatic light?
A. 550 nm B. 600 nm C. 650 nm D. 700 nm E. 750 nm
Intensity of Sound: Two people are talking at a distance of 3.0 m from where you are, and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers. Calculate a reasonable estimate for the sound intensity that the other student measures.
A. 6.2 × 10-8 W/m2 B. 1.5 × 10-7 W/m2 C. 8.3 × 10-8 W/m2 D. 7.8 × 10-7 W/m2 E. 2.5 × 10-8 W/m2
Which physical mechanism could explain the fact that the atmospheric concentration of CO2 varies slightly over the course of each year?
A) Major volcanic eruptions every decade or so place additional CO2 in the atmosphere. B) Every few years, another huge coal-powered power plant opens up and produces more CO2. C) Seasonal changes in plant growth produce a regular yearly variation in CO2 levels, with the Northern Hemisphere (with much more land area) causing almost all the variation.
Energy to support an origin of life in a Europan ocean would probably come from
A) deep-sea volcanic vents B) sunlight filtering through the ice C) meteoroid impacts on the surface D) heat generated from Jupiter's magnetic field