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dimulka [17.4K]
3 years ago
15

1. An EM wave representing 650 nm laser light is traveling in the +zˆ direction. At one point in space and time, the electric fi

eld is in the +yˆ direction (i.s., the polarization of the wave is along the yˆ direction). Assume that the amplitude of the electric field is 20.0 V/m.
(a) At this same location in space/time, in what direction is the magnetic field pointing?
(b) What is the magnitude of the magnetic field?
(c) What is the magnitude of the average power per unit area of this wave?
Physics
1 answer:
ivann1987 [24]3 years ago
5 0

Answer:

Explanation:

a ) Direction of the magnetic field will be in positive x direction.

The direction of the vector E X B gives the direction of motion of wave.

b ) Magnitude of magnetic field is given by the relation

E₀ / B₀ = c , c is velocity of light

B₀ = E₀ / c

= 20 / (3 x 10⁸)

= 6.67 x 10⁻⁸ T

c ) Average power flowing per unit area by this wave is called Poynting vector

c ε₀E₀² , ε₀ = 8.85X10⁻¹²

= 3 X 10⁸ X 8.85 X 10⁻¹² X 20²

= 1.062 W m⁻²

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A man walks 400 m in the direction 45° north of east. Represent this vector graphically by
Marrrta [24]

Answer:

Explanation:

Coordinate system is one that describe the location of an object in a given plane. It implies the use of axes (coordinates) and points.

Given that the man in the question walks 400 m due north of east. The cardinal points can be used in this case, with the north and east cardinals as the required axis.

scale = \frac{length on drawing}{original length}

         = \frac{10}{400}

         = \frac{1}{40}

scale = 1:40

This is a reduced scale which implies that 1 cm on the drawing is equal to 40 m on the original length.

The man's direction is 45^{o} north of east.

The graphical drawing of the vector is herewith attached to this answer.

5 0
3 years ago
Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond.
pochemuha
It [the diamond] would act like a prism, and make a rainbow, or, the light would break up and disappear

Hope I helped!
~Mathlete12321

5 0
3 years ago
If two capacitors, A and B, have the same area and dielectric constant, but the distance between the plates of A is twice the di
emmasim [6.3K]

Answer:

Plate B will have a higher capacitance

Explanation:

One of the conditions affecting the capacitance of a capacitor is spacing between plates, the greater the spacing the lesser the capacitance and vice versa.

Hence plate B will have the B will have higher capacitance since the spacing is less when compared with that of plate A

7 0
3 years ago
The velocity of a particle moving along the xaxis varies according to the expres-sion v = 40 - 5t², where vis in meters per seco
Afina-wow [57]

(A) -10m/s^2

(B) the average acceleration in the specified time in interval Δt = tb - ta =2.0sis

The rate at which the velocity changes is referred to as average acceleration. To determine the average acceleration of something, we divide the change in velocity by the amount of time that has passed.

For instance, the average acceleration of a crazy ball would be 20 cm/s/s if its velocity increased from 0 to 60 cm/s in 3 seconds. The marble's velocity will therefore rise by 20 cm/s per second as a result.

As a result, we can see that the definition of average acceleration is the ratio of change in velocity to change in time for a certain interval. The average acceleration is calculated over a given period of time and contrasted with instantaneous acceleration. The final velocity less the starting velocity divided by the total time is the average acceleration.

To learn more about average acceleration please visit-
brainly.com/question/17352997
#SPJ9

4 0
1 year ago
Three 7 0hm resistors are connected in series across a 10 V battery. What is the equivalent resistance of the circuit?
Tomtit [17]

Given

Three 7 ohm resistor are in series.

The battery is V=10V

To find

The equivalent resistance

Explanation

When the resistance are in series then the resistance are added to find its equivalent.

Thus the equivalent resistance is:

R=7+7+7=21\Omega

Conclusion

The equivalent resistance is 21 ohm

4 0
1 year ago
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