Answer: D. X-rays from space do not reach the ground.
What is the primary reason that we launch X-ray telescopes into space rather than building them on the ground?
A. It is less expensive to launch them into space.
B. On the ground, there would be too much light pollution from nearby cities.
C. Atmospheric turbulence blurs X-ray images too much.
D. X-rays from space do not reach the ground.
Physics & Space Science
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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?
Physics & Space Science
The energy required to ionize a hydrogen atom whose electron is in the ground state (energy level 1 ) is:
A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.
Physics & Space Science
A pinhole cameras has no lens. The tiny pinhole opening insures that rays of light from different parts of an object
A) overlap. B) don't overlap. C) bend to a focus.
Physics & Space Science
The mathematical form of Coulomb's law is similar to that of
a. the second law of thermodynamics. b. the second law of motion. c. Kepler's second law. d. the law of gravitation.
Physics & Space Science