What is gravitational lensing and why does it occur?
What will be an ideal response?
Answer: It is the distortion of the appearance of distant objects due to gravity and occurs because their light passes through regions of space that are curved.
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It is found that lead from 2-mm-thick old paint on a certain wood surface has permeated to 1000 ppm at a depth of 2 mm below the outer wood surface. If the paint contains 20% (by mass) lead and was applied 20 years before the lead content to the wood was measured, estimate the diffusivity of the lead into the wood if it is found that the paint has lost 50% of the original amount of the lead. Assume that the lead did not diffuse into the air. Wood may be approximated as cellulose, C6 H10 O5, with molecular weight of 116, lead has molecular weight of 207, and the paint density may be taken as 1020 kg/m^3 when new.
What will be an ideal response?
The capture of too few solar neutrinos by Davis in the solar neutrino experiment
a. has been disproved by the results of later experiments. b. can be explained if the sun is not undergoing thermonuclear fusion of hydrogen in its core. c. indicates that the sun's core is much hotter than expected. d. indicates that the sun's core is convective. e. none of the above
If the 14 billion year history of the universe were compressed to one year, and "now" is exactly midnight December 31, approximately how long ago were your grandparents born?
A) 0.15 second ago B) 1 second ago C) 1 minute ago D) 1 hour ago
Which of the following energy transformations represents the operation of a wind turbine [a device that uses the wind as an energy resource]?
A) Thermal E ? Electric E B) Electric E ? Kin E C) Grav E ? Electric E D) Kin E ? Electric E