1) By what fraction is the kinetic energy of a neutron decreased in a head-on elastic collision with an atomic nucleus initially at rest?  2)Find the fractional decrease in the kinetic energy of a neutron when it collides in this way with a lead nucleus, an oxygen nucleus, a nitrogen nucleus and a hydrogen nucleus. The ratio of nuclear mass to neutron mass is 206 for lead, 16 for oxygen, 14 for nitrogen and 1 for hydrogen.

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1) By what fraction is the kinetic energy of a neutron decreased in a head-on elastic collision with an atomic nucleus initially at rest? 

2)Find the fractional decrease in the kinetic energy of a neutron when it
collides in this way with a lead nucleus, an oxygen nucleus, a nitrogen nucleus and a hydrogen nucleus. The ratio of nuclear mass to neutron mass is 206 for lead, 16 for oxygen, 14 for nitrogen and 1 for hydrogen.

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