26. The branch of physics that deals with the behavior of matter and energy at very small scales is called:
a) Quantum physics
b) Thermodynamics
c) Optics
d) Mechanics
Answer: a) Quantum physics
27. The minimum amount of energy that can be gained or lost by an atom is called a:
a) Quark
b) Photon
c) Neutrino
d) Quantum
Answer: d) Quantum
28. The SI unit of frequency is the:
a) Newton
b) Joule
c) Hertz
d) Watt
Answer: c) Hertz
29. The force that holds the nucleus of an atom together is called:
a) Gravitational force
b) Electromagnetic force
c) Strong nuclear force
d) Weak nuclear force
Answer: c) Strong nuclear force
30. The process of a nucleus splitting into two smaller nuclei is called:
a) Fusion
b) Fission
c) Decay
d) Diffusion
Answer: b) Fission
