An α particle is a positively charge particle which is the nucleus of a helium atom 42he. An engineer who studied physics 158 e&m is designing a detector using a long metal wire and a uniform plastic plate. The details are as follows -- the long line carrying a uniform linear charge density +50. 0 μc/m runs parallel to and 10. 0cm from the surface of a large, flat plastic plate that has a uniform surface charge density of −100μc/m2 on one side

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome