Exam 5 (chapters 7&8) Flashcards
What is wavelength? How is it represented and what are the units?
Wavelength is the distance between two consecutive peaks or troughs in a wave; Symbol: λ; units nm
What is frequency? How is it represented and what are the units?
Frequency is the number of waves per second that pass a given point in space; symbol: v; units 1/s, s-1, Hz
1 Hz = ? s-1
1 Hz = 1 s-1
frequency and wavelength have a _____ relationship
inverse
What equation do we use to relate frequency and wavelength
C= (λ)(v)
In the equation C= (λ)(v) what does each symbol represent
C= the speed of light
λ= wavelength
v= frequency
What is the constant used to express C (the speed of light)
2.998 x 10^8 m/s
How can we rearrange the equation C= (λ)(v) to find frequency (v)
v = c/λ
How can we rearrange the equation C=(λ)(v) to find wavelength (λ)
λ=c/v
What equation can be used to calculate energy
E=hc/λ
In the equation E=hc/λ what does h (planck’s constant) stand for
h= planck’s constant = 6.626 x 10^-34J
going from red to violet E (energy) _______
Increases (ROY G BIV) —–>
As E goes up V goes ______ and λ goes _______
v goes up; λ goes down
what are energy levels
the allowed states that electrons occupy
What is the ground state of an atom
the lowest energy level (n=1)
What is an atoms excited state
anywhere where n is greater than 1
What is electron transmission
movement of electrons between energy levels
What is emission (what type of heat process, does is release E or require E, how is the E moving?)
exothermic, releases E, moving E from a higher level to a lower level
What is Absorption (what type of heat process, does is release E or require E, how is the E moving?)
endothermic, requires E, moving E from a lower level to a higher level
What equation do we use to calculate the change in E? (eg. moving from n=5 to n=3)
∆E = -Rh (1/n^2 final - 1/n^2 initial)
In the equation
