A solar cell has a light-gathering area of 10 cm2 and produces 0.30 A at 0.80 V (DC) when illuminated with sunlight of intensity 1000 W/m2 . What is the efficiency of the solar cell?
a. 16%
c. 7%
b. 4%
d. 24%
D
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What do we mean by the star-gas-star cycle?
A) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium. B) It is the idea that stars in close binary systems can exchange gas with one another. C) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars. D) It describes the orbits of the stars and interstellar medium around the center of the galaxy.
Mort and Velma are twins, born at the same time on Earth. Velma is taken on a long trip into outer space, at a speed close to lightspeed, and returns to Earth. When she returns,
A) Mort observes that he is younger than Velma, but Velma will observe that she is younger than Mort. B) Mort and Velma observe that they have aged equally. C) Mort observes that he is older than Velma, and Velma observes that she is older than Mort. D) Mort and Velma both observe that Velma is older than Mort. E) Mort and Velma both observe that Mort is older than Velma.
Refer to the graph. The acceleration of the object is equal to zero
A. in region A. B. in region B. C. in region C. D. in regions A and C. E. The acceleration is never equal to zero
Inside a space station in orbit around Earth:
a. there is no gravity because of the height of the station far above Earth. b. there is no gravity because the station is in orbit. c. gravity appears absent because everything is moving and accelerating together. d. objects have no mass because they are in orbit. e. gravitational effects feel the same as on Earth.