The half-life of radium is
A) the time after which an individual radium atom splits in half.
B) the time during which half of a large number of radium atoms will decay.
C) half the lifetime of the individual radium atom.
D) the life-time of the individual radium atom.
E) half of the total time during which a quantity of radium will radioactively decay.
B
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Measuring stellar masses using binary stars is difficult because binary stars are rare.
Answer the following statement true (T) or false (F)
Suppose you are in a spaceship accelerating away from Earth at 9.8 m/ s2 (1 g), so that you can walk on the floor of your spaceship as though experiencing normal gravity on Earth
Is it possible for you to consider yourself to be at rest? Why or why not? A) No, because you feel a force so you must truly be accelerating. B) No, because you are accelerating away from Earth, and it's not legitimate to claim that Earth is accelerating away from you. C) Yes, by assuming you are feeling effects of gravity and that Earth is accelerating away from you because it is in freefall. D) Yes, but only if believe that you are the center of the universe.
An object is moving in a horizontal circle, in a clockwise direction (as viewed from above). In which direction does its angular momentum vector point?
A. Toward the viewer B. Away from the viewer C. From the ball toward the center of the circle D. To the viewer's left
Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the magnitude of the overall magnification of the microscope?
A. 250 B. 300 C. 350 D. 400 E. 450