A Doppler red shift indicates
a. a shift toward higher frequencies.
b. a shift toward shorter wavelengths.
c. that a light source is approaching relative to the observer.
d. none of these.
d
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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?
Angular Quantities: A chicken is running in a circular path with an angular speed of 1.52 rad/s. How long does it take the chicken to complete one revolution?
A. 4.13 s B. 2.07 s C. 118 s D. 4.77 s E. 8.26 s
Three cars, car X, car Y, and car Z, begin accelerating from rest at the same time. Car X is more massive than car Y, which is more massive than car Z. The net accelerating force exerted on each car is identical
After 10 seconds, which car has the most amount of momentum? A) They all have the same amount of momentum. B) Car X C) Car Y D) Car Z
Matter Waves: If a proton and an electron have the same speed, which one has the longer de Broglie wavelength?
A. the electron B. the proton C. It is the same for both of them.