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Q5: As a spaceship moves away from you
Q18: The fanning out of waves upon passing
Q19: The discreteness of orbits of electrons in
Q21: Light from two closely-spaced stars cannot produce
Q32: In gravitational red shift, the quantity that
Q47: The uncertainty principle tells us that the
Q66: A friend says that changing electric and
Q68: Which of these lamps employs semi-conductor technology?<br>A)incandescent
Q105: A small railroad car is pulled by
Q136: A garden hose is held at an