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Nuetrik [128]
3 years ago
11

If the radius of a coin is 1 cm then calculate its area.​

Physics
2 answers:
igor_vitrenko [27]3 years ago
5 0

Answer:

3.14*1²

3.14 cm²

I hope this will help

swat323 years ago
4 0

Answer:

3.14 cm squared

Explanation:

I hope this will help.

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What is radioactive dating? How is it used to determine age of something?
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A light beam travels at 1.94×108 in quartz. The wavelength of the light in quartz is 355 .Part AWhat is the index of refraction
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A) 1.55

The speed of light in a medium is given by:

v=\frac{c}{n}

where

c=3\cdot 10^8 m/s is the speed of light in a vacuum

n is the refractive index of the material

In this problem, the speed of light in quartz is

v=1.94\cdot 10^8 m/s

So we can re-arrange the previous formula to find n, the index of refraction of quartz:

n=\frac{c}{v}=\frac{3\cdot 10^8 m/s}{1.94\cdot 10^8 m/s}=1.55

B) 550.3 nm

The relationship between the wavelength of the light in air and in quartz is

\lambda=\frac{\lambda_0}{n}

where

\lambda is the wavelenght in quartz

\lambda_0 is the wavelength in air

n is the refractive index

For the light in this problem, we have

\lambda=355 nm\\n=1.55

Therefore, we can re-arrange the equation to find \lambda_0, the wavelength in air:

\lambda_0 = n\lambda=(1.55)(355 nm)=550.3 nm

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Which statement describes the density of the inner planets?
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Answer:

The inner planets are less dense than the outer planets

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