A Neutron with a Mass of 1

question 22

Multiple Choice

A neutron with a mass of 1.67 × 10^-27 kg traveling east with a kinetic energy of 2.00 × 10^-21 J collides perfectly elastically with a helium nucleus with a mass 6.68 × 10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80 × 10^-21 J. What angle was the neutron deflected during the collision?

• A)142°
• B)117°
• C)38.0°
• D)180°
• E)32.8°

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