What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.60) is 25°?
a. 40°
c. 43°
b. 25°
d. 16°
C
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An emission line results from an electron falling from a higher to lower energy orbital around its atomic nucleus
Indicate whether the statement is true or false
A simple pendulum, 1.00 m in length, is released from rest when the support string is at an angle of 48.0° from the vertical. What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)
a. 4.43 m/s b. 3.82 m/s c. 6.49 m/s d. 2.55 m/s e. 1.62 m/s
A solution with a pH of 14 is
a. strongly acidic. b. weakly basic. c. strongly basic. d. weakly acidic.
Suppose a satellite orbits the earth so closely that it experiences some drag due to the earth’s upper atmosphere. This will drain away some of the orbital energy of this system, converting it to thermal energy. If this happens fairly slowly, the satellite’s orbit will remain nearly circular. What happens to the radius of this satellite’s orbit as time passes in this case?
A. It slowly decreases. B. It remains the same: just the satellite’s speed decreases. C. It slowly increases