In what manner have astronomers and physicists made tests to confirm that Einstein's theory of general relativity is actually a proper description of gravitational phenomena?
What will be an ideal response?
A number of tests have confirmed Einstein's theory of general relativity. The first two, as mentioned in the text, are the deflection of starlight near the Sun during a total solar eclipse and the precision of the orbit of Mercury. In both cases, general relativity accurately predicted what was observed and could not be explained using classical physics. We have also observed gravitational redshift in the starlight given off by dense objects such as white dwarfs and neutron stars.
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Upon what data do measurements of sizes of eclipsing binaries depend?
A) their orbital periods and separations B) their masses and luminosities C) their Doppler shifts and durations of stages of their eclipses D) their temperatures and speeds E) their temperatures and masses
Three charged particles are arranged on corners of a square as shown in Figure OQ23.11, with charge -Q on both the particle at the upper left corner and the particle at the lower right corner and with charge +2Q on the particle at the lower left corner. What is the direction of the electric field at the upper right corner, which is a point in empty space?
When a hydrogen atom absorbs a photon that raises it to the n = 7 state, what is the greatest number of photons that can be emitted by that atom as it returns to the ground state?
a. 6 b. 7 c. 8 d. 14 e. The correct answer is not given.
An electric heating blanket is subjected to an acceptance test. It is to dissipate 400 W on the high setting when hanging in air at 20°C. (a) If the blanket is 1.3-m-wide: what is the length required if its average temperature at the high setting is to be 40°C, (b) If the average temperature at the low setting is to be 30°C, what rate of dissipation is possible?
GIVEN
• An electric blanket hanging in air
• Heat dissipation rate (qh) = 400 W
• Air temperature (T?) = 20°C
• Blanket width (w) = 1.3 m
• Average temperatures ? High (Tsh) = 40°C
? Low (Ts1) = 30°C
FIND
(a) The length of the blanket (L) (b) Heat dissipation rate on the low setting (q1) ASSUMPTIONS
• Air is still
• Moisture in the air has a negligible effect
• Blanket is hung vertically with its 1.3 m sides vertical
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperatures for the two settings
