An object is placed on a surface. A student tries to apply various combinations of forces on the object. Which pair of forces wi
1 answer:
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A: Has a higher frequency --> X-rays
B: Travels at the same speed --> Both
C: Has a longer wavelength --> Radio waves
Explanation:
Electromagnetic waves are waves consisting of oscillations of electric and magnetic field in a direction perpendicular to the direction of motion of the wave.
Electromagnetic waves travel at the speed of light () in a vacuum, and they are transverse in nature (the direction of vibration is perpendicular to the direction of propagation).
Electromagnetic waves are classified into different types according to their wavelength and frequency. In order from shortest to longest wavelength (and so, from highest to lowest frequency, since frequency is inversely proportional to the wavelength), we have:
Gamma rays
X-rays
Ultraviolet radiation
Visible light
Infrared radiation
Microwaves
Radio waves
Therefore, we can no says that:
X-rays: has a higher frequency than Radio waves
Radio waves: have a longer wavelength than x-rays
Both: they travel at the same speed
Therefore, the correct pairing is:
A: Has a higher frequency --> X-rays
B: Travels at the same speed --> Both
C: Has a longer wavelength --> Radio waves
Learn more about electromagnetic waves:
#LearnwithBrainly
1)
The capacitance of a parallel-plate capacitor is given by:
where
is the vacuum permittivity
A is the area of each plate
d is the distance between the plates
Here, the radius of each plate is
so the area is
While the separation between the plates is
So the capacitance is
And now we can find the energy stored,which is given by:
2) 0.71 J/m^3
The magnitude of the electric field is given by
and the energy density of the electric field is given by
and using
, we find