Increased reactant concentration usually leads to an increase in reaction rate, because collisions are
a. more violent only.
b. more frequent only.
c. both more violent and more frequent.
d. none of these
b
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The diameter of the sun is 1.39*109 m. Estimate the percentage of the total radiation emitted by the sun, which approximates a blackbody at 5760 K, that is actually intercepted by the Earth. Of the total radiation falling on the Earth, about 70% falls on the ocean. Estimate the amount of radiation from the sun that falls on land, and then estimate the ratio of energy currently used worldwide and the amount of terrestrial solar energy that is available. Discuss why all of the energy cannot be harnessed.
GIVEN • Diameter of sun (Ds)= 1.39*109 m • Sun is approximate black body at temperature (Ts) =5760 K • 70% of radiation falls on the ocean. • Diameter of the earth (De)= 1.27*107 m • Distance between sun and earth (Rse )=1.53*1011 m FIND • Amount of radiation from sun that falls on land • Ratio of energy currently used worldwide and the amount of terrestrial solar energy that is available. • Discuss why all energy cannot be harnessed. ASSUMPTIONS • The sun’s radiation is assumed as ideal black body radiation.
Describe two ways of detecting extrasolar planets
What will be an ideal response?
A stretched string can have ______________ natural frequency(ies)
a. one b. 10 times its length in c. 5 times its length in d. many
Images of objects are formed by lenses because of
a. refraction. b. diffraction. c. internal reflection. d. all of these.