If a virtual image is formed along the principal axis 15 cm from a concave mirror with the focal length 15 cm, what is the object distance from the mirror?
a. 6.0 cm
c. 30 cm
b. 10 cm
d. 7.5 cm
D
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A pane of glass having transmissivity of 0.8 between wavelengths of 0 to 4 ?m and 0 above 4 ?m is subjected to direct radiation from the sun on one side and from a room on the other side. Assume that the sun is a black body at 6000 K and the room is a black body at 300 K. Determine the net radiation through the glass.
Which statement is true when comparing Saturn to Jupiter? a. Saturn has rings and Jupiter does not
b. Saturn has stronger winds than Jupiter. c. Saturn is closer to the Sun than Jupiter. d. Saturn is composed of more hydrogen and helium than Jupiter. e. Saturn has a more distinct belt-zones than Jupiter.
A hypothetical PV solar cell in space can utilize solar radiation between 0.8 and 1.1 ?m in wavelength. Estimate the maximum theoretical efficiency for this solar cell facing the sun using the ideal blackbody curve of the sun as the source. Supposing that all the radiation outside the spectral range utilized by the solar cell for generating electricity is dissipated into heat, estimate the rate at which a module of solar cells of 1.0 m2 area would have to be cooled to maintain the temperature of the module below 90°F.
GIVEN • PV solar cell utilizing radiation between 0.8 and 1.1 ?m. • Surface area of solar cells (A)= 1.0 m2 FIND • Maximum theoretical efficiency of solar cell facing the sun using ideal blackbody curve of the sun. • Rate at which module of solar cells would have to be cooled to maintain temperature of module below 900F or 320C. ASSUMPTIONS • The sun’s radiation can be assumed as ideal black body curve. • The variation in irradiation is linear for the interval of 0.8 to 1.1 ?m.
When light is either reflected or refracted, the quantity that does not change in either process is its
A. direction of travel. B. dispersion. C. frequency. D. speed. E. wavelength.