Which of the following elements is produced by high-mass stars but not low-mass stars?
A. Carbon
B. Lead
C. Rubidium
D. Strontium
E. Nitrogen
Answer: C
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Using an integral to calculate a sum over f (n) (where n is an integer) is a good approximation when
A. the summed values f (n) are individually small. B. the value of f (n) varies only very slowly with n. C. the value of f (n) goes to zero as n goes to infinity. D. the value of f (n) goes to zero as n goes to zero. E. All of the conditions above are true.
A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
A photoautotroph gets its energy from
A) the Sun and its carbon from other organisms B) chemical reactions and its carbon from other organisms C) chemical reactions and its carbon from its environment D) the Sun and its carbon from the its environment
A loop or sheet of gas hanging above an active region of the Sun is a(n) ________, often striking along the limb during total eclipses
A) sunspot B) flare C) aurora D) prominence E) granule