WQTP 3 Flashcards
A _ is an SI unit for energy
Joule
Quantum theory is the study of _ on the atomic and subatomic levels (2)
Matter
Energy
Quantum theory is the study of matter and energy in the _ levels (2)
Atomic
Subatomic
Quantum theory allows scientists to understand how _ behave and make predictions
Electrons
According to quantum theory, energy is always emitted in _ multiples of hv
Whole-number
Whole number multiples of hv example
Hv, hv 2, hv 3, etc.
Not whole number hv example
Hv 3.2
Albert Einstein developed theory of
Relativity
Einstein awarded Nobel prize in 1921 for his discovery of
Law of photoelectric effect
Albert Einstein took _ theory to the next level
Planck’s
Took planck’s theory to the next level by shooting a _ into a metal surface
Beam of light
The beam of light caused _ to be emitted
Electrons
Electrons being emitted by beam of light onto a metal surface called
Photoelectric effect
Einstein found that the number of electrons being ejected from metal surface was proportional to
The brightness of the light
Brighter light meant
More electrons being ejected
For Electrons to be ejected, energy of light must be (photoelectric effect)
Above a certain frequency
The frequency that light must be above is known as
The threshold frequency
Why it requires enough frequency to push out electrons
Electrons in metal atoms are held together tightly
Beam of light that is able to eject electron from metal called a
Photon
The photon that ejected electron was a
Particle of light
A photon equals a
Quantum
Photons are (n,s)
Neutral
Stable
Photons have no
Mass
Photons interact with
Electrons
Photons have energy and speed that is dependent on
Electron’s frequency
A photon can travel at the speed of light but only ()
In a vacuum (outer space)
All _ are made of photons (2)
Light
EM energy
Quantum theory allows scientists to predict and understand how _ will behave
Electrons
Partial photons cannot be emitted from an object because
Photons are only emitted in whole numbers
Photons differ from electrons because photons are
Massless
Photon is the smallest _ like a quantum
Unit of energy
