If the speed of light in a vaccum is c, the speed of light in a medium like glass with an index of refraction of 1.5 is : (a) 3c
1 answer:
Answer:
The speed of light in the medium is
(c) correct option.
Explanation:
Given that,
Speed of light in vacuum = c
Refraction index = 1.5
We need to calculate the value of speed of light in the medium
The refractive index is equal to the speed of light in vacuum divide by the speed of light in medium.
Using formula of refractive index
Where, c = speed of light in vacuum
v = speed of light in medium
Put the value into the formula
Hence, The speed of light in the medium is
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Now having information on the speed at the lowest point we can say that the energy of the system at this point is purely kinetic:
Where m is the mass of the pendulum. Because of conservation of energy, the total energy at maximum height won't change, but at this point the energy will be purely potential energy instead.
This is the part where we exploit the Energy's conservation, I'm really insisting on this fact right here but it's very very important, The totam energy Em was
It hasn't changed! So inserting this into the equation relating the total energy at the highest point we'll have:
Solving for h gives us:
It doesn't depend on mass!