Spectral line patterns are
A) the same for all elements and molecules
B) unique for each element and molecule
C) unique for each different molecule but the same for all elements
D) unique for each element but the same for all molecules
B
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A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. If the area of the loop increases at a rate of area 1.50 × 10^–3 m2/s, what is the magnitude of the emf induced in the coil?
a. 1.11 mV b. 3.00 mV c. 0.218 mV d. 0.589 mV
Significant amounts of liquid water last existed on the surface of Mars during the
A) Noachian Era B) Amazonian Era C) Hadean Era D) Hesperian Era
A _____ is a collapsing cloud of gas and dust destined to become a star
A) protostar B) protocloud C) stellar cluster D) stellar association
A lawn mower has a 6-horsepower engine (1 HP = 750 W). If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is
a. 1 800 J b. 2 000 J c. 2 200 J d. 2 400 J e. 2 250 J