M11 Flashcards
model of electromagnetic energy describes the variations in the
electric and magnetic fields as the photons travel with velocity (c). The
important properties of this model are frequency, represented by f, and
wavelength represented by Greek letter lambda (λ).
The sine wave
of electromagnetic energy describes the variations in the
electric and magnetic fields as the photons travel with velocity (c). The
important properties of this model are frequency, represented by f, and
wavelength represented by Greek letter lambda (λ).
The sine wave model
The rate of rise and fall is . It is usually identified as cycles per second.
frequency
The frequency unit of measurement is
the hertz (Hz).
One hertz is equal to .
1 cycle per
second
is equal to the number of crests or the number of valleys per unit of time.
The frequency
is the number of wavelengths that pass a point of observation per second.
Frequency
is the distance from one crest to another, from one valley to another, or from any point on the sine wave to the next corresponding point.
The wavelength
As the _____ is increased, the _____ is reduced. The wave ______ is
not related to the wavelength or frequency.
frequency, wavelength, amplitude
Three parameters – – are needed to
describe electromagnetic energy. The relationship among these parameters is
important.
velocity, frequency, and wavelength
A change in one affects the value of others. _____ is constant.
Velocity
A simple mathematical formula, called the ______, expresses this
interrelationship:
Velocity = Frequency x Wavelength
V = fλ
wave equation
SI units for wavelength
1 Angstrom (Å)
1.0 x 10-10m
The constant
proportionality, known as
Planck’s constant
Planck’s constant symbolized by
h,
