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strojnjashka [21]
3 years ago
5

There is less difference between the speed of light in glass and the speed of light in water than there is between the speed of

light in glass and the speed of light in air. Does this mean that a magnifying glass will magnify more or magnify less when it is used under water rather than in air?
Physics
1 answer:
CaHeK987 [17]3 years ago
8 0

Answer: no, the magnifying glass has nothing to do with the speed of light.

Explanation: When light moves between 2 media (refraction), part of it properties that changes during this process is it speed.

The change in speed is dependent on the refractive index of the 2 media and as given by snell's law, the refractive index is inversely proportional to wave speed.

This implies that moving from dense to a more dense medium reduces wave speed and moving from dense to less dense medium increases wave speed.

For the first statement, light moved from glass to water, it implies that it moves from a dense to a less dense medium, it wave speed increases in water.

For the second statement, light moved from glass to air, it implies that it also moves from a dense to a less dense medium and it wave speed will also increase in air.

Looking at both second medium, for the first statement, the second medium is water, and for the second statement, the second medium is air.

Air is less dense that water, hence light travel faster in air than in water.

Thus we can see that the magnification property of a glass has nothing to do with the wave speed, just the refractive indices of the media.

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200 kW of solar radiation is shining on a 300 m^2 parking lot. What is the insulation on the parking lot?
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That's "<em><u>insolation</u></em>" ... not "insulation".

'Insolation' is simply the intensity of solar radiation over some area.

If 200 kW of radiation is shining on 300 m² of area, then the insolation is

           (200 kW) / (300 m²) = <em>(666 and 2/3) watt/m²</em> .

Note that this is the intensity of the <em><u>incident</u></em> radiation.  It doesn't say anything
about how much soaks in or how much bounces off.

Wait ! 
I just looked back at the choices, and realized that I didn't answer the question
at all.  I have no idea what  "1 sun"  means.  Forgive me.  I have stolen your
points, and I am filled with remorse.

Wait again !
I found it, through literally several seconds of online research.

           1 sun = 1 kW/m².

So 2/3 of a kW per m²  =  2/3 of 1 sun

That's between 0.5 sun and 1.0 sun.

I feel better now, and plus, I learned something.


7 0
3 years ago
How to convert 250 newton to pounds? It is likely to be difficult to move?
maxonik [38]
I have no idea I need the answer too
3 0
3 years ago
You watch a distant lady driving nails into her front porch at a regular rate of 1 stroke per second. You hear the sound of the
Igoryamba

Answer:

λ = 1360 m

Explanation:

Given data:

frequency of driving nails is given as 1 stroke per second mean at every 0.25 sec she hit the nails

speed of sound is given as 340 m/s

we know that the wave equation is given as

Speed = frequency × wavelength,

v = f × λ

where,

v = speed in meters/second (m/s)

f = frequency in Hertz (Hz)

substituing value to get wavelength  of her driving nails

340 m/s = (1Hz)\times  \lambda

\lambda = \frac{340}{0.25}

λ = 1360 m

4 0
3 years ago
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What is the object’s acceleration?
Nat2105 [25]

Answer:

the acceleration of object is 3m/1s

5 0
3 years ago
The minute hand of a wall clock measures 16 cm from its tip to the axis about which it rotates. The magnitude and angle of the d
olya-2409 [2.1K]

Answer:

Explanation:

Given

Minute hand length =16 cm

Time at a quarter after the hour to half past i.e. 1 hr 45 min

Angle covered by minute hand in 1 hr is 360 and in 45 minutes 270

|r|=\frac{3\times 2\pi r}{4}=75.408 cm

Angle =270^{\circ}

(c)For the next half hour

Effectively it has covered 2 revolution and a quarter

|r|=\frac{2\pi r}{4}=25.136 cm

angle turned =90^{\circ}

(f)Hour after that

After an hour it again comes back to its original position thus displacement is same =25.136

Angle turned will also be same i.e. 90 ^{\circ}

7 0
3 years ago
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