Estimate the emf using graph shown Voltage AV = IR vs. Current
1.54
1.53
1.52
1.51
Voltage AV (Volts)
1.5
1.49
1.48
1.47
0
0.02
0.04
0.1
0.12
0.06 0.08
Current (A)

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

force tends to be low and long diustance masses are high

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.