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3 years ago

Why can electromagnetic waves travel through a vacuum?

Physics

1 answer:

ElenaW [278]3 years ago

4 0

Electromagnetic waves travel through a vacuum, Because it has an electric and a magnetic component in it.

<u>Explanation:</u>

The vibration that is created in an electric charge is the cause for the creation of an electromagnetic wave. The electromagnetic waves contains a magnetic and an electric component in it because of this vibration. The transportation of the energy at 3.00 x 108 m/s speed in an empty space.

The electric and magnetic components that are present in an electromagnetic wave is called fields. There is a vibration at an angle of 90 degree by these fields with respect to the wave motion. The light speed remains unchanged.

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The maximum wavelength that an electromagnetic wave can have and still eject electrons from a metal surface is 542 nm. What is t

Veseljchak [2.6K]

Answer:

2.295 eV

Explanation:

maximum wavelength, λ = 542 nm = 542 x 10^-9 m

The work function of the metal is defined as the minimum amount of energy falling on the metal so that the photo electrons just ejects the surface of metal.

$W_{o}=\frac{hc}{\lambda }$

where, h is the Plank's constant and c be the speed of light

h = 6.634 x 10^-34 Js

c = 3 x 10^8 m/s

$W_{o}=\frac{6.634\times 10^{-34}\times 3\times 10^{8}}{542\times10^{-9} }$

$W_{o}=3.67\times 10^{-19} J=\frac{3.67\times 10^{-19}}{1.6\times 10^{-19}} eV$

Wo = 2.295 eV

Thus, the work function of this metal is 2.295 eV.

5 0

3 years ago

According to Lenz's law, an induced current in the direction depicted in the picture would be created when: a. An external downw

LenKa [72]

Answer:

C. An external downward field is created or an external downward field is removed

Explanation:

As we can see that from the attached figure that the induced current would be counter clockwise. So the field occur because of induced current i.e. out of page. This represent that the current is induced in order to rise the flux out of the direction of the page

Therefore because of the external field, the field out of page & flux would be reducing or the external upward field is eliminated

So option C is correct

7 0

3 years ago

I had to throw a softball for a lab and record data. How would I solve for Initial Velocity, the angle at which it was thrown, a

Makovka662 [10]

Answer:

it depends who throwing the softball and the velocity depends on the person who chucking the ball at 90mph and then there's 100mph

Explanation:

7 0

4 years ago

Put a ball on the floor what forces are acting on it

In-s [12.5K]

Answer: Gravity

Explanation: Gravity is pulling down on the ball, making it stay on the floor

8 0

4 years ago

How many octaves are there in the human audible-frequency range?.

ra1l [238]

Answer:

ten octaves

Explanation:

Answer. One octave, corresponding to a halving of the upper frequency limit. Although human hearing covers a range of, say, ten octaves at best, seven of these octaves cover the bottom eighth of the range, from 20 Hz up to 2500 Hz, which corresponds roughly to the pitch range from E♭0 to E♭7 (Figure 26).

6 0

3 years ago