Adecade before einstein published his theory of relativity, j. j. thomson proposed that the electron might consist of small parts and attributed the electron's mass m to the electric potential energy of the interaction of the parts. furthermore, he suggested that the energy equals mc2, where c is the speed of light. assume the electron is a hollow sphere. make a rough estimate of the electron mass in the following way: assume the electron is composed of three identical parts that are brought in from infinity and placed at the vertices of an equilateral triangle having sides equal to the classical radius of the electron, 2.82 x 10-15 m. find the total electric potential energy of this arrangement.

they are playing too much beyblade in the office

explanation:

no sign of dia of fuel cell

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.