41. Who discovered the concept of the uncertainty principle?
a) Werner Heisenberg
b) Isaac Newton
c) Galileo Galilei
d) James Clerk Maxwell
Answer: a) Werner Heisenberg
42. Who discovered the concept of the photoelectric effect?
a) Albert Einstein
b) Isaac Newton
c) Galileo Galilei
d) James Clerk Maxwell
Answer: a) Albert Einstein
43. Who discovered the concept of the strong nuclear force?
a) Hideki Yukawa
b) Isaac Newton
c) Galileo Galilei
d) James Clerk Maxwell
Answer: a) Hideki Yukawa
44. Who discovered the concept of the weak nuclear force?
a) Enrico Fermi
b) Isaac Newton
c) Galileo Galilei
d) James Clerk Maxwell
Answer: a) Enrico Fermi
45. Who discovered the concept of the electromagnetic force?
a) James Clerk Maxwell
b) Isaac Newton
c) Galileo Galilei
d) Albert Einstein
Answer: a) James Clerk Maxwell
