marpinator
22.01.2021 •
Physics
Please answer it correctly. I’ll give brain-list to correct answer
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Ответ:
I'm sure it's B.
Explanation: Magnets attract paper clips because magnets have a magnetic field, which creates a force, that pulls on other ferromagnetic materials. A paper clip is usually made of steel wire. Steel is an alloy of iron and carbon. Iron is a ferromagnetic material that is attracted by magnets. Hope this Helps!
Ответ:
Ответ:
a) The UV-B has frequencies between and
b) The radiation with a frequency of belong to the UV-A category.
Explanation:
(a) Find the range of frequencies for UV-B radiation.
Ultraviolet light belongs to the electromagnetic spectrum, which distributes radiation along it in order of different frequencies or wavelengths.
Higher frequencies:
Gamma rayX ray Ultraviolet raysVisible regionLower frequencies:
InfraredMicrowaveRadio wavesThat radiation is formed by electromagnetic waves, which are transverse waves formed by an electric field and a magnetic field perpendicular to it. Any of those radiations will have a speed of in vacuum.
The velocity of a wave can be determined by means of the following equation:
(1)
Where c is the speed of light, is the frequency and is the wavelength.
Then, from equation 1 the frequency can be isolated.
(2)
Before using equation 2 to determine the range of UV-B it is necessary to express in units of meters in order to match with the units from c.
⇒
⇒
Hence, the UV-B has frequencies between and
(b) In which of these three categories does radiation with a frequency of belong.
The same approach followed in part A will be used to answer part B.
Case for UV-A:
⇒
Hence, the UV-A has frequencies between and .
Therefore, the radiation with a frequency of belongs to UV-A category.