A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?
a. 90°
c. 0°
b. 180°
d. 360°
B
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Which of the following particles is not stable?
A) photon B) electron C) tau neutrino D) muon E) proton
What is the gravitational force between two 20-kg iron balls separated by a distance of 0.5 m? The gravitational constant is G = 6.67 ´ 10-11 N-m2/kg2.
A. 2.67 ´ 10-9 N B. 5.34 ´ 10-9 N C. 5.34 ´ 10-8 N D. 1.07 ´ 10-7 N
A beam of electrons is sent in the positive x direction in a region with a uniform magnetic field B in the positive y direction and a uniform electric field E in the positive z direction. At which of the following speeds would the electrons be deflected in the positive z direction?
a. v = E/B b. There is no speed for which this will happen. c. v < E/B d. v > E/B
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20)
This fact relates to the organization of the periodic table in that strontium and calcium are both A) metals. B) in group 2 of the periodic table. C) made of relatively large atoms. D) soluble in water.