What is the critical angle?
a. The angle of incidence below which total internal reflection takes place.
b. The smallest angle of incidence that is greater than its angle of reflection.
c. The angle of incidence above which total internal reflection takes place.
d. The angle of incidence that equals its angle of refraction.
e. The angle at which light enters a new material.
c
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Planetary nebulae are sites of planet formation
a. True b. False Indicate whether the statement is true or false
When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to the
A) bottom of the tower. B) middle of the tower. C) top of the tower. D) all the same
Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 107 m/s?
A. 5.8 kV B. 2.6 kV C. 7.1 kV D. 8.6 kV E. 5.1 kV
Currents in Earth's molten iron core create the planet's magnetic field. These currents are probably caused by
A. radioactivity and convection. B. rotational motion and radioactivity. C. rotational motion and convection. D. rifting and subduction.