Correct Option
Sir William Henry Bragg and his son, William Lawrence Bragg, were jointly awarded the Nobel Prize in Physics in 1915. They received the prize for their services in the analysis of crystal structure by means of X-rays. William Lawrence Bragg was 25 years old at the time, making him the youngest Nobel laureate in Physics to date.
Incorrect Options
Max Planck was awarded the Nobel Prize in Physics in 1918 for his discovery of energy quanta. He is considered the founder of quantum theory. He did not share the prize with his son.
Albert Einstein received the Nobel Prize in Physics in 1921 for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect. He did not share the prize with his son.
Enrico Fermi was awarded the Nobel Prize in Physics in 1938 for his demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons. He did not share the prize with his son.