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3 years ago

Help me I need help anyone

Physics

2 answers:

katovenus [111]3 years ago

8 0

Is a physical change because only the state of the matter has changed.

Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.

It has not combined with the water to cause an irreversible chemical reaction.

vodomira [7]3 years ago

5 0

boil off water. salt residue left. just answered this q somewhere else.

the salt is the same as it was before

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Canola oil is less dense than water, so it floats on water, but its index of refraction is 1.47, higher than that of water. When

kupik [55]

Answer:

therefore critical angle c= 69.79°

Explanation:

Canola oil is less dense than water, so it floats over water.

Given $n_{canola}= 1.47$

which is higher than that of water

refractive index of water $n_{water}=1.33$

to calculate critical angle of light going from the oil into water

we know that

$sinc= \frac{n_{water}}{n_{canola}}$

now putting values we get

$sinc= \frac{1.33}{1.47}$

c= $sin^{-1}(\frac{1.33}{1.47} )$

c=69.79°

therefore critical angle c= 69.79°

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3 years ago

g How many diffraction maxima are contained in a region of the Fraunhofer single-slit pattern, subtending an angle of 2.12°, for

lbvjy [14]

Answer:

Explanation:

We know that in the Fraunhofer single-slit pattern,

maxima is given by

$a\text{sin}\theta=\frac{2N+1}{2}\lambda$

Given values

θ=2.12°

slit width a= 0.110 mm.

wavelength λ= 582 nm

Now plugging values to calculate N we get

$0.110\times10^{-3}\text{sin}2.12=(\frac{2N+1}{2})582\times10^{-9}$

Solving the above equation we get

we N= 2.313≅ 2

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3 years ago

Was the Big Bang a loud explosion? Why?

Sholpan [36]

Answer:

bc it was a universal explosion and It started the future

Explanation:

FACTS

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inysia [295]

Answer:

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3 years ago