Light of wavelength 500 nm illuminates a soap film ( n = 1.33). What is the minimum thickness of film that will give an interference maximum when the light is incident normally on it?
A)
24 nm
B)
94 nm
C)
188 nm
D)
279 nm
E)
376 nm
B
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Suppose we launch a disk so it rolls without slipping up an incline. The disk of course slows down as it moves up the incline. But in what direction does the friction force acting on the disk point?
A. Up the incline B. Down the incline C. In some other direction (specify) D. The friction force is zero in this case.
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.
What observational evidence proved that gamma ray bursts do not come from objects in our galaxy?
What will be an ideal response?
A Ferris wheel starts from rest and builds up to a final angular speed of 1.9 rad/s while rotating through an angular displacement of 4.9 rad. What is its average angular acceleration?
a. 9.3 rad/s2 b. 0.37 rad/s2 c. 2.6 rad/s2 d. 0.39 rad/s2