Tiny grains of zirconium silicate (zircons) found embedded in sedimentary rocks have been radiometrically dated to what age?
A) 4.57 billion years ago
B) 3.85 billion years ago
C) 4.38 billion years ago
D) 4.02 billion years ago
C
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Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in parallel with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in parallel with the other two. As the lightbulbs are added, the
individual currents in the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
When the isotope bismuth-213 emits an alpha particle, what new element results?
A) lead B) platinum C) polonium D) thallium
The electric potential at a distance d from a point charge is V. At a distance d’, the potential is 2V. What is the ratio of electric field at d’ to that at d?
A. 4 B. more information is necessary C. 2 D. 1?2 E. 1?4
Velocity Selector: A singly-charged ion enters a velocity selector that has a 0.18-T magnetic field perpendicular to an electric field of 1.6 kV/m, with both fields perpendicular to the velocity of the ion. The same magnetic field is then used to deflect the ion into a circular path of radius 12.5 cm. (e = 1.60 × 10-19 C)(a) What velocity was selected by the velocity selector?(b) What was the mass of the ion?
What will be an ideal response?