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4 years ago

How is radiation different from convection and conduction?

Physics

1 answer:

Anna11 [10]4 years ago

8 0

Answer: It can travel through empty space

Explanation:

Let's begin by explaining that there are three ways in which the thermal transfer occurs:

1. By Conduction, when the transmission is by the direct contact.

2. By Convection, heat transfer in fluids (like water or the air, for example).

3. By Radiation, by the electromagnetic waves (they can travel through any medium and in vacumm) .

Hence, both conduction and convection need matter to transfer thermal energy, but by radiation there is no need of matter for the heat transfer.

So, since outter space is vacuum (sometimes called "empty" or "empty space"), energy cannot be transmitted by convection, nor conduction. Therfore, it must be transmitted by electromagnetic waves that are able to travel with or without a medium (by radiation).

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What elements are good conductors of electricity?

kramer

In solids: All metals are good conductors of electricity as they contain free moving electrons. Non-metals doesn't conduct , but we consider Graphite the only non-metal that can conduct electricity for the presence of free moving electrons.

In Liquids ; Ionic compunds contains free moving ions , so they conduct electricity as well .

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4 years ago

A tank of gasoline (n = 1.40) is open to the air (n = 1.00). A thin film of liquid floats on the gasoline and has a refractive i

klio [65]

Answer:

1.08

Explanation:

This is the case of interference in thin films in which interference bands are formed due to constructive interference of two reflected light waves , one from upper layer and the other from lower layer . If t be the thickness and μ be the refractive index then

path difference created will be 2μ t.

For light coming from rarer to denser medium , a phase change of π occurs additionally after reflection from denser medium, here, two times, once from upper layer and then from the lower layer , so for constructive interference

path diff = nλ , for minimum t , n =1

path diff = λ

2μ t. = λ

μ = λ / 2t

= 626 / 2 x 290

= 1.08

5 0

4 years ago

During the period that the moon’s phases are changing from new to full, the moon is _____. waxing exhibiting retrograde motion w

Sindrei [870]

The answer that best fits the blank is the term WAXING. The moon is waxing whenever it reaches to the period that its phases are transitioning from new to full. The answer is the first option. This is when it is more that half is illuminated. Hope this helps.

3 0

3 years ago

Read 2 more answers

A large semi-truck is moving a house from one lot to another. The amount of force required to move the house 15.A horizontally a

dlinn [17]

Answer:

252J

Explanation:

Given parameters:

Distance = 72m

Force = 3.5N

Unknown:

Work done on the house = ?

Solution:

Work done is the force applied to move a body through a particular distance.

Work done = Force x distance

Now insert the parameters and solve;

Work done = 3.5 x 72 = 252J

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3 years ago

How far does the moon move away from earth every year?

Oxana [17]

The moon is moving away from Earth at a rate of approximately 3.78 cm per year.
This migration of the Moon from the Earth is mainly due to the action of the Earth tides. It can be explained as follows:
- the Moon exerts a gravitational force on the Earth, which is stronger at the Equator (since the Equator is closer to the Moon), creating the tides
- However, the Earth rotates faster on its axis (one rotation every 24 hours) than the Moon (one rotation every 27 days), therefore the tidal bulge on Earth tries to pull the Moon "ahead" in its orbit. As a result, the Moon tends to sped up.
- As opposite reaction, the Earth tends to slow down in its rotation, with a loss of angular momentum. Since the angular momentum must be conserved, the radius of the orbit of the Moon becomes larger, and this explains why the Moon is moving away from the Earth.

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4 years ago

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