Sources of red, blue, and yellow light each emit light with a power of 50 mW. Which source emits the least photons per second?
a. the red source
b. They all emit the same number per second. c. the blue source
d. the yellow source
C
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The apparent path that the Sun traces annually along the celestial sphere is known as the ______________
Fill in the blank(s) with correct word
Why doesn’t Earth have large volcanoes like those on Mars?
a. Earth's gravitational field is very strong and it pulls the planet into a spherical shape. b. Earth is not as geologically active as Mars. c. Earth’s crust is not thick enough to support such large mountains, moreover, its plates move. d. Large mountains on Earth are quickly eroded by the active dense atmosphere.
A slice of bread contains about 90 kcal. If specific heat of a person were 1.00 kcal/kg•°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?
a. 2.25°C c. 1.43°C b. 1.86°C d. 1.29°C
What factor is not in the Drake Equation?
A: Fraction of stars with planets B: Number of habitable planets per star with planets C: Communication lag due to large distances between stars D: Fraction of life-bearing planets on which intelligence involves E: Average lifetime of a technologically competent civilization