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2 years ago

T or F A red-hot object is hotter than one that is while-hot?

Physics

1 answer:

leva [86]2 years ago

5 0

Answer:

True. The two laws of thermal radiation state; 1) "Each square meter of a hotter object

Explanation:

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What is the best way to dress for an outdoor trip in cold weather?

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Answer: A: wear several thin layers and a waterproof top layer

Explanation:

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2 years ago

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A very thin oil film (n = 1.25) floats on water (n = 1.33). What is the thinnest film that produces a strong reflection for gree

mixer [17]

Answer:

200 nm is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm

Explanation:

If two reflected waves interfere constructively ,strong reflection is produced. Two reflected waves will experience a phase change

For constructive interference

$2\times n\times t=m\lambda$

for thinnest film m=1

refractive index should be taken for film n=1.25

thickness of the thinnest film is

$t=\frac{m\lambda}{2n} \\t=\frac{1\times 500}{2\times 1.25} \\t=200 nm$

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3 years ago

A star produces energy by? ( a p e x )

katen-ka-za [31]

Answer and Explanation:

Stars create energy primarily through the fusion of hydrogen into helium through nuclear reactions.

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3 years ago

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galina1969 [7]

A. elastic motion because that's the answer

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2 years ago

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Light of wavelength 550 nm comes into a thin slit and produces a diffraction pattern on a board 8.0 m away. The first minimum da

FrozenT [24]

Answer:

Width of the slit will be equal to 1.47 mm

Explanation:

We have given wavelength of the light $\lambda =550nm=550\times 10^{-9}m$

Distance D = 8 m

Distance between first minimum dark fringe and the central maximum is 2 mm

So $x=3\times 10^{-3}m$

We have to find the width of the slit

For the first order wavelength is equal to $\lambda =\frac{x}{D}\times a$ , here a width of slit

So $a=\frac{\lambda D}{x}=\frac{550\times 10^{-9}\times 8}{3\times 10^{-3}}=1466.666\times 10^{-6}=1.47mm$

So width of the slit will be equal to 1.47 mm

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3 years ago