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4 years ago

If the speed of light in a vacuum is 1.2 times that of the speed of light in a

Physics

2 answers:

irinina [24]4 years ago

7 0

Refractive Index for the material is 1.2

Explanation:

Formula for Refractive index of the material (n) = speed of light in vacuum/speed of light in the material

Given detail is speed of light in vacuum = 1.2 (speed of light in the material)

⇒ Speed of light in vacuum/Speed of light in the material

= 1.2 = n

The refractive index and the index of refraction are same. It describes how light travels through a substance.

igomit [66]4 years ago

6 0

Answer:

Explanation:

Refractive index if denoted by n is different for different materials.

Let, the speed of light in vacuum = v₁= 3x10⁸m/s

refractive index of vacuum= n₁= 1

refractive index of second medium= n₂= 1.2

now according to Snell's law

n₁ / n₂ = v₂ / v₁

thus the speed of light in second medium with refractive index 1.2 will be

v₂ = v₁ (n₁ / n₂)= 3x 10⁸m/s(1/1.2)= 2.5x10⁸ m/s

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A 3-kg object is attached to a spring and moving in simple harmonic motion. Its angular frequency is 20 rads/sec. When the mass-

Trava [24]

Answer:19.5 J

Explanation:

Given

mass of block=3 kg

angular frequency=20 rad/sec

spring constant $k=\omega _n^2m=1200 N/m$

we know total energy remain conserved

$E_T at x=0.1 m$

$E_T=E_P+E_K$

Where $E_K$ =kinetic energy

$E_P$ =potential Energy

$E_P=\frac{1}{2}kx^2$

$E_P=600\times 0.01=6 J$

$E_K=\frac{1}{2}mv^2$

$E_K=\frac{1}{2}\times 3\times 3^2=13.5 J$

$E_T=13.5+6=19.5 J$

When mass reaches amplitude its velocity becomes zero

there is only potential energy which is equal to Total energy

$E_T=E_P=19.5 J$

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3 years ago

Why do nuclear power plants use fission rather than fusion to generate

kicyunya [14]

B. Fusion requires very high pressure and temperature.

Explanation:

Nuclear fusion is the combination of atomic nuclei into larger ones with the release of a large amount of energy.

Nuclear fission is the decay process in which a heavy nuclide is bombarded with with neutrons.

Both processes release a huge amount of energy.
But fusion produces far more energy.
The reason why nuclear fusion is not in use is because of the high pressure and temperature needed start it.
The activation energy is high and the energy barrier is very great.
Only the core of the sun naturally favors fusion

learn more:

transmutation brainly.com/question/3433940

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3 years ago

Read 2 more answers

A piece of lead has mass of 22.7 it occupies a volume of 2 cm3 what is the destiny of the lead

inna [77]

Density=m/v so d=22.7/2 which gives you an answer of 11.35

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3 years ago

For a wavelength of 420 nm, a diffraction grating produces a bright fringe at an angle of 24°. For an unknown wavelength, the sa

Inessa [10]

Answer:

649.8420 nm

Explanation:

We have given $\Theta _1=24^{\circ} \ and\ \Theta _2=39^{\circ}$

$\lambda _1=420\ nm$ we have to find unknown wavelength that is $\lambda _2$

The condition for constructive interference is $dsin\Theta =n\lambda$

Where d is distance between slits $\Theta$ is angle of emergence and n is order of maxima

Using constructive interference equation

$dsin\Theta _1=n\lambda _1$ ---------eqn 1

$dsin\Theta _2=n\lambda _2$ ---------eqn 2

On dividing eqn 1 by eqn 2

$\frac{\lambda _1}{\lambda _2}=\frac{sin\Theta _1}{sin\Theta _2}$

$\frac{420}{\lambda _2}=\frac{sin24^{\circ}}{sin39^{\circ}}$

$\lambda _2=649.8420\ nm$

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3 years ago

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katen-ka-za [31]

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3 years ago