How can you increase the frequency of a simple pendulum

- Move to a location where the acceleration due to gravity is larger

- Shorten the length of the pendulum

Explanation:

The frequency of a simple pendulum is given by

where

L is the length of the pendulum

g is the gravitational acceleration

From the formula, we notice that

- As the value of g increases, the frequency of the pendulum increases as well

- As the value of L increases, the frequency of the pendulum decreases

So, in order to increase the frequency of the pendulum, we can:

- Move to a location where the acceleration due to gravity, g, is larger

- Shorten the length of the pendulum (if L decreases, then the frequency increases)

this means that the temperature of both substances will be equal

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.