A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30° from its initial direction of motion. What is the y component of the velocity of the 1.0-kg object just after the collision?
a. ?3.7 m/s
b. ?3.4 m/s
c. ?1.5 m/s
d. ?2.4 m/s
e. ?4.1 m/s
c
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Refer to the figure above. Suppose that an electron makes a transition from n = 3 to n = 2 and emits a photon of frequency 4 × 1014 Hz. Then an electron that makes a transition from n = 3 to n = 1 may emit a photon with a frequency of
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