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CHEM chapter 7
quiz....sometime
15
Chemistry
10th Grade
10/11/2011

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Term
WAVELENGTH
Definition
the distance between two successive wave crests
Term
FREQUENCY
Definition
number of wave cycles per unit time
Term
ELECTROMAGNETIC RADIATION
Definition
radio waves, radar, microwaves, infrared, visible light, UV, X-rays, gamma rays
Term
EMISSION SPECTRA
Definition
the frequencies of light emitted by an element
Term
PHOTON
Definition
a quanta of light
Term
BALMER SERIES
Definition
the series of visible lines in the emission spectra of an element. AKA the emission spectra
Term
LINE EMISSION SPECTRA:
Definition
the pattern of colored lines formed when light from excited atoms in the gaseous state is passed through a ______???
Term
What is plank's constant?
Definition
6.6*10^-34J*s
Term
v stands for what, c stands for what, h stands for WHAT, while lambda stands for....
Definition
frequency
speed of light
plank's constant
wavelength
Term
c= _*_
Definition
vλ=C
Term
E=_*_
not mc2
Definition
E=hv
Term
DEFINE: PHOTOELECTRIC EFFECT
Definition
ejection of electrons when light strikes the surface of a metal
Term
Experiments with photoelectric cells show that electrons are ejected from the surface ONLY if ________
Definition
the frequency of the light if high enough
Term
Explain photoelectric cells
Definition
when light strikes the cathode of the cell, electrons are ejected from the cathode surface and move to a positively charged anode
Term
the greater number of ____, the greater the number of photons with this energy that strike the suraface
Definition
photons with needed energy to remove photon w/ atom
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