Unit 9: Modern Physics Vocab

Fill in the blank: The phenomenon whereby some materials eject electrons when exposed to light is called the __________.

• photoelectric effect

• electromagnetic induction

• nuclear fission

• thermal expansion

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Fill in the blank: A quantum, or particle, of electromagnetic radiation is known as a __________.

• photon

• electron

• neutron

• proton

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Fill in the blank: An electron that has been ejected from a material by a photon of light is called a __________.

• photoelectron

• neutron

• positron

• proton

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Fill in the blank: A group of devices that use the photoelectric effect for detection is called an __________.

• electric eye

• photoelectric cell

• light detector

• optical sensor

Fill in the blank: A discrete packet or bundle of a physical entity such as energy is called a __________.

• quantum

• atom

• molecule

• particle

Fill in the blank: The property of behaving like either a particle or a wave is known as __________.

• wave-particle duality

• quantum entanglement

• superposition

• uncertainty principle

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Fill in the blank: A diagram used to analyze the energy levels of electrons in the orbits of an atom is called an __________.

• energy level diagram

• Bohr model

• electron cloud

• atomic structure chart

Fill in the blank: Light consists of packets of energy (photons) that can only interact with the atoms and molecules of matter by being absorbed or emitted in discrete units. This is known as the __________.

• Photon Model of Light

• reflection

• Planetary Model of the Atom

• diffraction

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Fill in the blank: Any state beyond the n = 1 orbital in which the electron stores energy is called the __________.

• excited state

• ground state

• neutral state

• stable state

Fill in the blank: Black lines shown on an absorption spectrum that show the wavelengths absorbed by a gas are called __________.

• Fraunhofer lines

• emission lines

• spectral bands

• diffraction patterns

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