Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram
a. I & II
b. II & IV
c. I, II, & IV
d. II, III, & IV
e. I, II, III, & IV
e
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A radiometer has two square vanes (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 torque due to radiation pressure on the vane assembly about the vertical axis? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 2.4 × 10-12 N ? m B) 6.0 × 10-12 N ? m C) 1.2 × 10-11 N ? m D) 1.8 × 10-11 N ? m E) 2.4 × 10-11 N ? m
If a wave's frequency doubles and its speed stays constant, its wavelength
A) becomes 16× longer. B) is also doubled. C) is unchanged, as c is constant. D) is now 4× longer. E) is halved.
The evolution of a protostar slows significantly as it approaches the main sequence
Indicate whether the statement is true or false
The path difference for destructive interference is m?/2 where
A) m = 1, 2, 3, 4, ... B) m = 0, 2, 4, 6, ... C) m = 2, 4, 6 , 8, ... D) m = 0, 1, 2, 3, ... E) m = 1, 3, 5, 7, ...