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Is angle of declination a magnetic element at a place

A fixed mass of a gas occupies a volume of 450(centimeter cube) at a temperature of 27(degree centigrade) and a pressure of 65 cmHg. Calculate the volume , if the temperature increases to 127(degree centigrade)at constant pressure

A rail of length 15.05m increases to 15.10m when heated from 20(degree centigrade) to 41(degree centigrade). Calculate its linear expansivity

A certain radioactive substance has a half of 30 minutes. If the count rate was observed to be 300 after 90 minutes, determine its count rate at the beginning.