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3 years ago

By what process do electromagnetic waves release electrons from the

Physics

2 answers:

lesya [120]3 years ago

4 0

Answer:

A.) the photoelectric effect

Explanation:

iragen [17]3 years ago

4 0

Answer: A

Explanation:

A.p.e.x

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A plane electromagnetic wave varies sinusoidally at 90.0 MHz as it travels along the x direction. The peak value of the electric

mr_godi [17]

Answer:

Explanation:

frequency n = 90 x 10⁶ Hz .

time period T = 1 / n

= 1 / 90 x 10⁶

= 1.11 x 10⁻⁸ S.

wavelength = velocity of light / frequency

= 3 x 10⁸ / 90 x 10⁶

= 3.33 m

maximum value of the magnetic field. ( B₀ )

E₀ / B₀ = c where E₀ and B₀ are maximum electric and magnetic field .

E₀ / c= B₀

200/ 3 x 10⁸

= 66.67 x 10⁻⁸ T .

expressions in SI units for the space and time variations of the electric field

$E=E_{0y}sin(2\pi nt - \frac{2\pi x}{\lambda} )$

$E=200sin(180\times 10^6\pi t - \frac{2\pi x}{\lambda} )$ N/C

$B=B_{0z}sin(2\pi nt - \frac{2\pi x}{\lambda} )$

$B=66.67\times 10^{-8}sin(180\times 10^6\pi t - \frac{2\pi x}{\lambda} )$ T

4 0

4 years ago

I need help with this

fredd [130]

We have here what is known as parallel combination of resistors.

Using the relation:

$\frac{1}{ r_{eff} } = \frac{1}{ r_{1} } + \frac{1}{ r_{2} } + \frac{1}{ r_{3} }.. . + \frac{1}{ r_{n} } \\$
And then we can turn take the inverse to get the effective resistance.

Where r is the magnitude of the resistance offered by each resistor.

In this case we have,
(every term has an mho in the end)
$\frac{1}{10000} + \frac{1}{2000} + \frac{1}{1000} \\ \\ = \frac{1}{1000} ( \frac{1}{10} + \frac{1}{2} + \frac{1}{1} ) \\ \\ = \frac{1}{1000} ( \frac{31}{20}) \\ \\ = \frac{31}{20000}$

To ger effective resistance take the inverse:
we get,
$\frac{20000}{31} \: ohm \\ = 645 .16 \: ohm$

The potential difference is of 9V.

So the current flowing using ohm's law,

V = IR

will be, 0.0139 Amperes.

7 0

3 years ago

Which wave would have the greatest wave speed , a wave from a vibrating piano string in an auditorium or a sound wave created by

fenix001 [56]

The one in the water would have a much greater speed than the one in the air since energy is transmitted better and faster in liquid than gas.

7 0

4 years ago

Read 2 more answers

An avalanche takes place when ice and snow move down a slope with great speed. What effect does friction have on its rate of mov

vredina [299]

The answer is; D

The friction causes the ice at the base of the avalanche to melt into water (also due to the pressure of the weight of the ice-rock above). The melted water acts as a lubricant hence reducing the drag/friction in the avalanche movement. This increases its speed down the slope hence making it more destructive.

5 0

4 years ago

Read 2 more answers

A loop of wire is perpendicular to a magnetic field such that the field is coming straight at you through the loop. The field be

Umnica [9.8K]

Answer:

we will have induced magnetic field towards us

now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.

Explanation:

As per lenz law we know that the rate of change in magnetic flux linked with the closed loop will induced EMF in the loop and the direction of this induced current in the loop will always oppose the causes due to which it is induced

Here we know that magnetic field is straight towards us and it start decreasing with time

So we can say that flux linked with the coil will also decrease with time

Now as per lenz law the induced magnetic field of the loop is in such a direction that it will increase the magnetic flux in the coil.

So we will have induced magnetic field towards us

now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.

5 0

3 years ago