Light propagate faster through medium “a” than medium “b”
1. which of the medium had more optical density
2. state the condition at which no change in direction of propagation of path of light ray would take place when it passes through medium “a” to “b”

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Abucket full of water weights 4 kg and water well is 10m deep. a girl draws water from the well. it takes the girl 3 minutes to draw a bucket full of water from the well. what is the power of the girl?