Electromagnetic spectrum

Содержание и основные понятия

The spectrum ranges differ in frequency, wave length and interaction with the substance: boundaries are conditional and physical nature is uniform.
GEF · 11 grade
PIF · Baseline
Interactive model
spectrum
frequency
ionization
Radiation safety
01
The physical picture
What happens and what boundaries the model has.
Main message
The spectrum ranges differ in frequency, wave length and interaction with the substance: boundaries are conditional and physical nature is uniform.
Radio and microwaves are convenient for communication and heating.
Infrared is associated with thermal radiation, visible to the eye.
UV, X-rays and gammas with sufficient photon energy ionize the substance.
How to reason
First, name the system and the interaction, then select the values, and only then write down the law. The formula works within the model's assumptions.
02
Laws and values
Symbols should be read as a relationship of values, not as a recipe for substitution.
E
=
h
ν
E=h\nu
E
=
h
ν
Photon energy
λ
=
c
ν
\lambda=\frac{c}{\nu}
λ
=
ν
c
​
Wave length
Review of the situation
The reduction of the wave length doubles the frequency and energy of the individual photon.
04
Links and application
In the real world
The reduction of the wave length doubles the frequency and energy of the individual photon.
Model verification
Compare the prediction with observation, evaluate the units, the order of magnitude and the influence of the factors not taken into account. Disparity does not always mean an error of law: often idealization is no longer sufficient.
C
What needs to be understood
Outcome 1
Explain the physical meaning of the topic "Electromagnetic spectrum" through the model, not just through the formula.
Outcome 2
To distinguish and correctly use terms: spectrum, frequency, ionization.
Outcome 3
Indicate the conditions for the applicability of the law, verify units and limit cases.
T
Terms of the topic
The definition should indicate the physical meaning, not a substitute for a domestic synonym.
spectrum
Distribution of radiation or signal by frequency, wave length or energy.
frequency
Number of complete cycles per time.
ionization
The formation of charged particles from neutral atoms or molecules when the electrons are lost or joined.
Radiation safety
System of principles and measures limiting the harmful effects of ionizing radiation.
F
Origin and conclusion of the formulas
The fundamental law cannot be "proven" by algebras: for each record, it is stated whether it is a definition, an experimental law, or a model effect.
E
=
h
ν
E=h\nu
E
=
h
ν
Postulate or Model
Photon energy.
The following is an indication of the definition, experience or law from which this entry arises and where it is applicable.
E
∝
ν
E\propto\nu
E
∝
ν
Planck's quantum hypothesis connects the energy of a separate quant to the radiation frequency.
E
=
h
ν
E=h\nu
E
=
h
ν
The proportionality factor h is the constant Planck found from quantum experiments.
E
пучка
=
N
h
ν
E_{\text{пучка}}=Nh\nu
E
beam
​
=
N
h
ν
The power of the monochromatical beam is formed by the energy of the N photons.
Conditions:
One photon of electromagnetic frequency , measured in the selected inertial system of countdown.
Monitoring:
The dimensions of both parts shall coincide; the result shall be checked for sign, order and limit case.
λ
=
c
ν
\lambda=\frac{c}{\nu}
λ
=
ν
c
​
model effect
The length of the wave.
The following is an indication of the definition, experience or law from which this entry arises and where it is applicable.
c
=
λ
ν
c=\lambda\nu
c
=
λ
ν
During the wave period, a distance equal to the wave length passes through the vacuum.
λ
=
c
ν
\lambda=\frac{c}{\nu}
λ
=
ν
c
​
The distribution of the kinematic ratio by frequency reflects the length of the wave.
Conditions:
Monochromatic electromagnetic wave in the vacuum, > 0; the substance is used ~ = v/ .
Monitoring:
The dimensions of both parts shall coincide; the result shall be checked for sign, order and limit case.
!
Model boundaries and typical errors
Error: Forget model condition
You can't transfer the formula to any situation just because it's a coincidence of letters. The key condition of this topic is radio and microwaves are easy to communicate and heat.
How to Check the Mind
Infrared is associated with thermal radiation, visible is taken by the eye. Then check the units, vector direction and behaviour of the result at zero or very large parameter.
Σ
Conclusion on the topic
Electromagnetic spectrum
The spectrum ranges differ in frequency, wave length and interaction with the substance: boundaries are conditional and physical nature is uniform.
Radio and microwaves are convenient for communication and heating.
Infrared is associated with thermal radiation, visible to the eye.
Any numerical result shall be accompanied by a unit, a sign and an explanation of its physical meaning.
The content is consistent with the FRP on Physics of the OS/OSS 2025 and the subject matter of the current lines of the PNP: I. M. Peryškin and co-authors (7–9), G. J. Mäkishev and coauthors (10–11), and with the lines "Engineers of the Future" and V. A. Kasyanov. The original texts are not reproduced, the text of the textbooks is not reproduced.