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ololo11 [35]
4 years ago
9

Light from a laser pointer is goes through a window composed of crown glass, which has an index of refraction of 1.523. What is

the speed of the light while it is in the window glass
Physics
2 answers:
sesenic [268]4 years ago
8 0

Answer:

1.97 * 10^8 m/s

Explanation:

Parameters given:

Refractive index, n = 1.523

Refractive index is the ratio of the speed of light in a vacuum to the speed of light in a specified medium.

When the medium is glass, the refractive index is given as:

n = Vv/Vg

Where Vv = velocity of light in a vacuum

Vg = velocity of light in glass

The velocity of light in a vacuum is 3 * 10^8 m/s. Therefore,

1.523 = (3 * 10^8)/Vg

Vg = (3 * 10^8)/1.523

Vg = 1.97 * 10^8 m/s

aleksley [76]4 years ago
3 0

Answer:

1.97×10⁸ m/s

Explanation:

From Snell's Law,

Refractive index of glass = Speed of light in air/ speed of light in glass

R.I = N1/N2................ Equation 1

Where R.I = refractive index, N1 = Speed of light, N2 = speed of light in glass

Make N2 the subject of the equation

N2 = N1/R.I.................. Equation 2

Given: R.I = 1.523, N1 = 3×10⁸ m/s

Substitute into equation 2

N2 = 3×10⁸ /1.523

N2 = 1.97×10⁸ m/s

Hence the speed of light in the glass window = 1.97×10⁸ m/s

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λ = 3.62 x 10⁻⁷ m = 362 nm

Explanation:

The grating equation gives the relationship between the wavelength, the diffraction line order and the diffraction angle. The grating equation is written as follows:

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4 years ago
A crane raises a crate with a mass of 150 kg to a height of 20 m. Given that
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Answer:

\boxed {\boxed {\sf 29,400 \ Joules}}

Explanation:

Gravitational potential energy is the energy an object possesses due to its position. It is the product of mass, height, and acceleration due to gravity.

E_P= m \times g \times h

The object has a mass of 150 kilograms and is raised to a height of 20 meters. Since this is on Earth, the acceleration due to gravity is 9.8 meters per square second.

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Substitute the values into the formula.

E_p= 150 \ kg \times 9.8 \ m/s^2 \times 20 \ m

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E_p=1470 \ kg*m/s^2 \times 20 m

E_p=29400 \ kg*m^2/s^2

Convert the units.

1 kilogram meter square per second squared (1 kg *m²/s²) is equal to 1 Joule (J). Our answer of 29,400 kg*m²/s² is equal to 29,400 Joules.

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