What kind of light warms the stratosphere?
a. infrared
b. visible
c. ultraviolet
Answer : c. ultraviolet
You might also like to view...
Mary passes Mike from behind while bicycling. As she passes him,
A) the two have different speeds and different velocities. B) the two have the same speeds and the same velocities. C) Mike turns into a hippopotamus. D) the two have the same speeds but different velocities. E) the two have different speeds but the same velocities.
Which of the following cannot be determined from the spectrum of a star?
a. chemical composition b. surface temperature c. radial (along line of sight) velocity d. tangential (perpendicular to line of sight) velocity e. radial (along line of sight) velocity
A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0.00°C, are required to bring the mixture to 10°C?
The heat of fusion of ice is 334 kJ/kg, and we can assume that tea has essentially the same thermal properties as water, so its specific heat is 4190 J/(kg ? K). A) 1.0 kg B) 1.2 kg C) 1.4 kg D) 1.5 kg E) 1.7 kg
Visible sunspots lie in the
A) chromosphere. B) transition zone. C) corona. D) radiative zone. E) granulation in the photosphere.