As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
A.
, where n is a positive integer.B.
, where n is an odd integer.C.
, where n is an even integer.D.
E.
Answer: E
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In the situation shown in figure T2.5c, the width of the bell curve at half its peak value is 0.021U. If we multiply NA, NB, and U by a factor of 100, then the peak’s width (as you can check) is about 0.0021U. Suppose that we increase each solid’s N and the system’s total energy by another factor of 1018 to create solids containing 1/6 of a mole of atoms (still pretty small objects by everyday standards). Assuming that the trend continues, what will be the approximate width of the combined system’s probability bell curve as a fraction of U?
A. 2 × 10-20 B. 2 × 10-22 C. 2 × 10-10 D. 2 × 10-12 E. 2 × 10-40 F. 2 × 10-42 T. Some other factor (specify).
Might changes in the Sun affect weather or climate on Earth?
What will be an ideal response?
Gamma-ray bursts seem to come primarily from neutron star binaries in the plane of our own Milky Way Galaxy
Indicate whether the statement is true or false
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit. B. squint while looking in that direction. C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. E. reflect the rays from that direction on a shiny metal surface.