Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (He) from gold-197 nuclei (197 Au). The energy of the incoming helium nucleus was 7.02 x 10-13 J, and the masses of the helium and gold nuclei were 6.68 x 10-27 kg and 3.29 x 10-25 kg, respectively (note that their mass ratio is 4 to 197). (Assume that the helium nucleus travels in the +x direction before the collision.) (a) If a helium nucleus scatters to an angle of 136° during an elastic collision with a gold nucleus, calculate the helium nucleus' final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the +x-axis) of the gold nucleus. "He speed 14100000 197 Au velocity m/s × m/s 197 Au direction ☑counterclockwise from the +x-axis (b) What is the final kinetic energy (in J) of the helium nucleus? × J

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter30: Nuclear Physics
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Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small
and dense by scattering helium-4 nuclei (He) from gold-197 nuclei (197 Au). The energy of the incoming helium nucleus was
7.02 x 10-13 J, and the masses of the helium and gold nuclei were 6.68 x 10-27 kg and 3.29 x 10-25 kg, respectively (note that
their mass ratio is 4 to 197). (Assume that the helium nucleus travels in the +x direction before the collision.)
(a) If a helium nucleus scatters to an angle of 136° during an elastic collision with a gold nucleus, calculate the helium nucleus'
final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the +x-axis) of the gold
nucleus.
"He speed
14100000
197 Au velocity
m/s
× m/s
197 Au direction
☑counterclockwise from the +x-axis
(b) What is the final kinetic energy (in J) of the helium nucleus?
× J
Transcribed Image Text:Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (He) from gold-197 nuclei (197 Au). The energy of the incoming helium nucleus was 7.02 x 10-13 J, and the masses of the helium and gold nuclei were 6.68 x 10-27 kg and 3.29 x 10-25 kg, respectively (note that their mass ratio is 4 to 197). (Assume that the helium nucleus travels in the +x direction before the collision.) (a) If a helium nucleus scatters to an angle of 136° during an elastic collision with a gold nucleus, calculate the helium nucleus' final speed (in m/s) and the final velocity (magnitude in m/s and direction counterclockwise from the +x-axis) of the gold nucleus. "He speed 14100000 197 Au velocity m/s × m/s 197 Au direction ☑counterclockwise from the +x-axis (b) What is the final kinetic energy (in J) of the helium nucleus? × J
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