The 130-decibel sound of a rock band is times more intense than the 100-decibel sound of a nearby subway train.

The 130-decibel sound of a rock band is 1000 times more intense than the 100-decibel sound of a nearby subway train. The calculation is based on the sound intensity formula

I(db) = 10log(I/Io)

For the 130 Db

130=10log(I1/Io)

I1/Io =10^13

For the 100 Db

100=10log(I1/Io)

I2/Io =10^10

I1/Io/I2/Io=10^13/10^10^10

I1/I2=1000

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.

answeralert drivers who drift off the road;