If a proton and an electron are placed a short distance apart,
A) they will be repelled from each other.
B) they will feel no force.
C) they will be attracted to each other.
D) the electron will be repelled while the proton will be attracted.
E) None of the above.
C
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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?
What is the purpose of the observatory commonly called LIGO?
A) to detect gravitational waves B) to look for examples of gravitational lensing C) to test the equivalence principle D) to attempt observations of hyperspace
Compared to the wavelength of incident light, diffuse reflection occurs when the size of surface irregularities is
A) smaller. B) larger. C) about the same.
A diatomic molecule has 2.6 × 10-5 eV of rotational energy in the L = 2 quantum state
What is its rotational energy in the L = 1 quantum state? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 3.4 × 10-6 eV B) 7.8 × 10-6 eV C) 5.3 × 10-6 eV D) 8.7 × 10-6 eV