A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is the correct one?
a.
A
b.
B
c.
C
d.
D
e.
E
b
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The annealing point for the soda-lime glass in Figure 9.3 is approximately _________K
Fill in the blank(s) with the appropriate word(s).
At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere
a. less intense b. more intense c. the same intensity
Sound will be louder when a struck tuning fork is held
A) in the air. B) with its base against a tabletop. C) with its prongs in shallow water. D) in your closed fist.
Suppose you are carrying a ball and running at constant speed, and wish to throw the ball and catch it as it comes back down. You should
1.throw the ball at an angle of about 45° above the horizontal and maintain the same speed. 2.throw the ball straight up in the air and slow down to catch it. 3.throw the ball straight up in the air and maintain the same speed.