The leaves of a charged electroscope collapse in time. At higher altitudes, they collapse more rapidly. Why is this true? (?Hint:? The existence of cosmic rays was first indicated by this observation.)
Solution 12E STEP 1: The study of cosmic rays started with gold leaf electroscope experiment. The charge of a charged electroscope gradually moves out. It happens every time when we use electroscope. Ionising radiation coming from the outer space is the reason for leakage of charges. The ionising radiation many times stronger than -rays entering the earth from all the directions from cosmic or interstellar space is known as cosmic rays. The name, cosmic rays was given by Millikan. This is the reason behind the collapse of the leaves of a charged electroscope with time. STEP 2: But when we move upwards means when our altitude increases, there the electroscope leaves get collapsed even in a very small time. The cosmic rays contain charged particles. At high altitude, the atmosphere gets less denser and more cosmic ray hit the electroscope. CONCLUSION: So, at higher altitude they collapse more rapidly.