Phys 165- Module 10 Study Guide Graded A+
1). Continuous variables
Ans: have any real value
2). Quantized variable
Ans: a variable that has the smallest value and all possible integer multiple of that
smallest value.
3). Millikan's oil drop experiment
Ans: 1909, Robert took two metal plates , a variable electric power supply and some oil
in a spray bottle. The plates were put one on top of the other. A hole was made on the top
plate. Top plate had positive charge and the bottom plate had negative charge. He
sprayed oil through the hole into the space between the plates. He adjusted the voltage to
make the oil droplet reach equilibrium. He calculated the charge of the drop of oil. He
performed the experiment thousands of times.
this experiment proved : the charge of an object is quantized.
4). Blackbody
Ans: an ideal material that absorbs all frequencies of electromagnetic radiation and
emits all frequencies.
it absorbs all frequencies then appears black.
has an inverse proportion between the wavelength and the maximum intensity.
5). Max planck's theory
Ans: a blackbody is made up of tiny oscillators ( atoms or groups of atoms) and that
the oscillators can only give off energy when their own energy changes by certain
amounts.
6). Energy given off at a certain frequency
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, Ans: E = h*f
7). Planck's constant
Ans: h= 6.63 x 10 ^-34 Js
8). Photon
Ans: packet of energy
9). Energy given off when counting photons
Ans: E= n*h*f
10). The photoelectric effect
Ans: Discovered by Heinrich Hertz in 1887.
under the right conditions, when light shines on certain metals, electrons are ejected from
the metal.
11). Photoelectric effect 1
Ans: an electroscope is negatively charged and when ultraviolet light is shined on the
electroscope it discharges quickly.
The light causes the electroscope to emit the excess electrons.
visible energy does not have enough energy to eject electrons from the metal of the
electroscope.
12). Photoelectric effect 2
Ans: An apparatus that consists of a variable power supply and an ammeter, a vacuum
tube with two electrodes and a light source. The cathode will become negatively charged
and the anode will become positively charged. The charges will flow in the circuit until the
electrodes have enough charge in them to create the same voltage as the power supply.
The ammeter will not read any current.
13). Photoelectric effect 3
PaperStoc.com Page 2 of 12
1). Continuous variables
Ans: have any real value
2). Quantized variable
Ans: a variable that has the smallest value and all possible integer multiple of that
smallest value.
3). Millikan's oil drop experiment
Ans: 1909, Robert took two metal plates , a variable electric power supply and some oil
in a spray bottle. The plates were put one on top of the other. A hole was made on the top
plate. Top plate had positive charge and the bottom plate had negative charge. He
sprayed oil through the hole into the space between the plates. He adjusted the voltage to
make the oil droplet reach equilibrium. He calculated the charge of the drop of oil. He
performed the experiment thousands of times.
this experiment proved : the charge of an object is quantized.
4). Blackbody
Ans: an ideal material that absorbs all frequencies of electromagnetic radiation and
emits all frequencies.
it absorbs all frequencies then appears black.
has an inverse proportion between the wavelength and the maximum intensity.
5). Max planck's theory
Ans: a blackbody is made up of tiny oscillators ( atoms or groups of atoms) and that
the oscillators can only give off energy when their own energy changes by certain
amounts.
6). Energy given off at a certain frequency
PaperStoc.com Page 1 of 12
, Ans: E = h*f
7). Planck's constant
Ans: h= 6.63 x 10 ^-34 Js
8). Photon
Ans: packet of energy
9). Energy given off when counting photons
Ans: E= n*h*f
10). The photoelectric effect
Ans: Discovered by Heinrich Hertz in 1887.
under the right conditions, when light shines on certain metals, electrons are ejected from
the metal.
11). Photoelectric effect 1
Ans: an electroscope is negatively charged and when ultraviolet light is shined on the
electroscope it discharges quickly.
The light causes the electroscope to emit the excess electrons.
visible energy does not have enough energy to eject electrons from the metal of the
electroscope.
12). Photoelectric effect 2
Ans: An apparatus that consists of a variable power supply and an ammeter, a vacuum
tube with two electrodes and a light source. The cathode will become negatively charged
and the anode will become positively charged. The charges will flow in the circuit until the
electrodes have enough charge in them to create the same voltage as the power supply.
The ammeter will not read any current.
13). Photoelectric effect 3
PaperStoc.com Page 2 of 12
