ch 6
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electromagnetic radiation
is characterized by wavelenght and frequency
highest energy rays
gamma rays
lowest energy rays
radiowaves
light acts as
waves
c stands for
speed of light
h stands for
planks constant
what is the value of c
2.998x10^8 m/s
what does R stand for
Rydberg constant
Broglies equation
λ = h/mv, where λ is wavelength, h is Planck’s constant, m is the mass of a particle, moving at a velocity
What is a wavelenght and how is it measured?
is defined as the distance between a given point on a wave and the corresponding point in the next cycle of the wave; it is often measured as the distance between successive crests or high points of a wave
Frequency symbol and what is it
Frequency, symbolized by the Greek letter (ν), refers to the number of waves that pass a given point in some unit of time, usually per second.
What is the unit for frequency
The unit for frequency, written either as s−1 or 1/s and standing for 1 oscillation per second, is called a hertz
equation to relate c (speed of light) to wavelenght to v (frequency)
c(m/s)= λ(m) x v(1/s)
what is the speed of light in km/h?
(1.079×109 km/h)
Order of electromagnetic rays from highest to lowest
Electromagnetic radiation has a wide spectrum, including gamma y-rays, X-rays, UV rays, visible light, IR radiation, microwaves, and radio waves (FM and AM) and long radio waves.
Energy increases from
microwaves (lowest energy) to y rays. With y rays having the highest energy.
formula for energy
E=hc/λ=hv
Formula for wavelenght (debroglies)
λ=h/mv m is mass in kg v is velocity in m/s h is plancks constant wavelenght is in meters
When theres a large wavelenght what happens to energy and speed
As wavelenght increases, velocity decreases and energy is low
What happens to energy and velocity when wavelength becomes smaller and smaller
Energy increases and speed increases
What is the wavelength of visible light
From 380 nm for violet end to 750 nm to red end
What is the acronym for visible light
ROYGBIV RED HIGHEST WAVELENGTH ORANGE YELLOW GREEN BLUE INDIGO VIOLET LOWEST WAVELENGTH
How is a photon of light created?
When an electron changes from one atomic orbital to another, the electron’s energy changes. When the electron changes from an orbital with high energy to a lower energy state, a photon of light is created.
Rydberg equation to find spectral lines of h
Change in E (nm)= -Rhc (1/nf^2 - 1/ni^2) λ is the wavelength of the photon R = Rydberg’s constant c=speed of light h=plancks constant ni and nf are integers where nf > ni