What would the surface temperature be in this example if the greenhouse effect simply increased the surface temperature by the same number of degrees that it does today? Express your answer in degrees Celsius to three significant figures.
Answer : T2 = 539?C
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Which stars always have large positive absolute magnitude?
a. stars of high luminosity b. stars of low luminosity c. nearby stars d. distant stars e. not enough information given
The whiteness of clouds, unlike the blueness of the sky, primarily involves
A) medium sized particles. B) reflection and refraction of sunlight. C) seeds upon which condensation of cloud material forms. D) water prisms.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.
Kinetic energy is definitely conserved
Indicate whether the statement is true or false