An object is placed at F in front of a concave mirror with a focal length of 10 cm. What is the position of its image in relation to the mirror and what are its characteristics?
A) = 10 cm, real, smaller than object
B) = 10 cm, virtual, smaller than object
C) = 20 cm, real, bigger than object
D) = 20 cm, virtual, bigger than object
E) = ?, real, much bigger than the object
E
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A) Earth. B) a comet. C) an asteroid. D) the Sun.
The period-luminosity relation for Cepheid variables was discovered in 1908 by
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
The wavelength of the wave shown in this figure is about
a.
2 m.
b.
1.75 m.
c.
0.33 m.
d.
not defined.
e.
slightly over 5 m.
According to Wien's displacement law, if the absolute temperature of a radiating blackbody is doubled, then the peak wavelength emitted will change by what factor?
a. 4 c. 1 b. 2 d. 1/2