What happens to the light that is emitted from the accretion disk around a black hole?
A) It is redshifted.
B) It is blueshifted.
C) It is pulled in multiple directions by tides.
D) It cannot be seen from anywhere in our solar system.
E) It is absorbed by the black hole.
A
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Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) Earth would be inside the supergiant. B) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. C) Earth would fly off into interstellar space. D) The supergiant would appear as large as the full Moon in our sky.
A radiometer has two square vanes (each measuring 1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure
The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes. What is the electromagnetic power absorbed by the blackened vane? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 0.030 W B) 0.040 W C) 0.050 W D) 0.060 W E) 0.090 W
A battery maintains the electrical potential difference of 6.0-V between two large parallel metal plates separated by 1.0 mm. What is the strength of the electric field between the plates?
A) 6.0 V/m B) 600 V/m C) 6000 V/m D) zero
The following are positioned in sequence: A source of a beam of natural light of intensity I0; three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, from the perspective of the observer
The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. Which of the following pairs of angles are possible axis angle settings of polarizer B? A) 90° and 130° B) 90° and 140° C) 40° and 130° D) 40° and 90° E) 40° and 140°