According to Kirchhoff's first law why do dense, hot bodies create the type of spectrum they do?
What will be an ideal response?
The continuous spectrum is composed of all wavelengths, as the thermal energy of collisions in the dense medium comprises a host of different energies.
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When unpolarized light from air (with refractive index 1.00 ) strikes a piece of glass with index of refraction 1.80,
the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
In an air-free chamber, a pebble is thrown horizontally, and at the same instant a second pebble is dropped from the same height. Compare the times of fall of the two pebbles
A) The thrown pebble hits first. B) The dropped pebble hits first. C) They hit at the same time. D) We cannot tell without knowing which pebble is heavier.
A simply supported beam (L 5 4.5 m) with rectangular cross section (b 5 95 mm, h 5 280 mm) supports uniform load q 5 25 kN/m. The ratio of the magnitudes of the principal stresses (?1/?2) at a point a 5 1.0 m from the left support and distance d 5 100 mm up from the bottom of the beam is approximately:
(A) 9
(B) 17
(C) 31
(D) 41
The king's chamber of the great pyramid is 10.43 meters long, 5.21 meters wide, and 5.82 meters high. What is the volume of the chamber in cubic feet?
A) 316 cubic feet B) 3,720 cubic feet C) 6,530 cubic feet D) 11,200 cubic feet E) 13,200 cubic feet