In astronomical usage, all atoms heavier than helium are referred to as__________
A) metals
B) Population I atoms
C) halos
D) dark matter
A
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A kilometer contains 1 million meters
Indicate whether the statement is true or false
Which of the following is classified as "ionizing radiation"?
A) gamma rays B) alpha and beta radiation C) Both of the above. D) X-rays E) All of the above.
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT b. 12 mT c. 15 mT d. 22 mT e. 10 mT
Art museums use weaker wires than those used in homes because paintings in museums
A) are suspended by pairs of vertical wires. B) are usually lighter in weight. C) are more firmly attached.