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4 years ago

6

How much of the electromagnetic spectrum is visible light?

2 answers:

Margarita [4]4 years ago

8 0

I believe the answer is D, only a small part of it

ollegr [7]4 years ago

8 0

Answer:

D) a small part of it

Explanation:

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Thermopane window is constructed, using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm.

Bond [772]

To solve this problem it is necessary to apply the concepts related to rate of thermal conduction

$\frac{Q}{t} = \frac{kA\Delta T}{d}$

The letter Q represents the amount of heat transferred in a time t, k is the thermal conductivity constant for the material, A is the cross sectional area of the material transferring heat, $\Delta T$ , T is the difference in temperature between one side of the material and the other, and d is the thickness of the material.

The change made between glass and air would be determined by:

$(\frac{Q}{t})_{glass} = (\frac{Q}{t})_{air}$

$k_{glass}(\frac{A}{L})_{glass} \Delta T_{glass} = k_{air}(A/L)_{air} \Delta T_{air}$

$\Delta T_{air} = (\frac{k_{glass}}{k_{air}})(\frac{L_{air}}{L_{glass}}) \Delta T_{glass}$

$\Delta T_{air} = (\frac{0.84}{0.0234})(\frac{5}{4}) \Delta T_{glass}$

$\Delta T_{air} = 44.9 \Delta T_{glass}$

There are two layers of Glass and one layer of Air so the total temperature would be given as,

$\Delta T = \Delta T_{glass} +\Delta T_{air} +\Delta T_{glass}$

$\Delta T = 2\Delta T_{glass} +\Delta T_{air}$

$20\°C = 46.9\Delta T_{glass}$

$\Delta T_{glass} = 0.426\°C$

Finally the rate of heat flow through this windows is given as,

$\Delta {Q}{t} = k_{glass}\frac{A}{L_{glass}}\Delta T_{glass}$

$\Delta {Q}{t} = 0.84*24*10 -3*0.426$

$\Delta {Q}{t} = 179W$

Therefore the correct answer is D. 180W.

3 0

3 years ago

What is the magnification of a virtual image if the image is 60.0 cm from a

Hatshy [7]

Answer:

4cm

Explanation:

Magnification of the virtual image

= image distance / object distance

Given

Image distance = 60.0cm

Object distance = 15.0cm

Therefore,

Magnification = 60.0/15.0

= 4 cm

6 0

3 years ago

Read 2 more answers

What is the direction of propagation of the wave if E⃗ =Ei^,B⃗ =−Bj^. Express the direction of the propagation vector, P⃗ , as a

nataly862011 [7]

Answer with Explanation:

We are given that

Electric field vector= $\vec{E}=E\hat{i}$

Magnetic field vector= $\vec{B}=-B\hat{j}$

We have to find the direction of propagation of the wave.

We know that

The direction of propagation of wave= $\vec{E}\times \vec{B}$

The direction of propagation of wave= $\hat{i}\times (-\hat{j})=-\hat{k}$

Because ( $\hat{i}\times \hat{j}=\hat{k}$ )

The wave propagate in -z direction.

Therefore, the component of the vector is (0,0,-1).

Hence, the direction of the propagation of wave is - z direction and component of direction of propagation vector is (0,0,-1).

6 0

4 years ago

Give two quantitative observation george might record

Over [174]

There are four chipmunks on that tree

two of the dogs have white fur

8 0

3 years ago

What is the displacement of this time velocity graph i need help asap

maw [93]

Answer:

b is the answer

Explanation:

because i did this before

3 0

4 years ago