How can asteroids be distinguished from stars in telescope observations?
A) Asteroids move relative to the stars.
B) Asteroids are much dimmer than stars.
C) Asteroids are much redder than stars.
D) Asteroids are much brighter than stars.
E) Asteroids are not spherical.
A) Asteroids move relative to the stars.
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Snell's Law: A thin laser beam traveling in air strikes the surface of a glass plate at 41.2° with the normal. In the plate, this beam makes an angle of 22.4° with the normal. What is the speed of light in this glass? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Dielectrics: A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A. There is no change in the field. B. The field becomes stronger. C. The field becomes weaker. D. The field reduces to zero.
In a given period, the element of which group has the highest ionization energy?
a. 2A b. 8A c. 7A d. 1A
Can we be certain that one of the balloons in Question 2 is electrostatically charged?