(1) A metal M emits electron when heated to 700°C while another metal N emits electrons only when heated to 1250°C , explain why.
(2) Why are gamma rays produced during nuclear disintegration?
(3) If the distance between two masses is reduced to quarter, comment about the magnitude force between them.



1) metal M has a Lower work function compared to N so it emits electrons at a much lower temperature compared to N 2) Gamma rays are produced in nuclear disintegration when the substance is in the excited state but after the emission of gamma rays,there is no change in mass or atomic number 3) the magnitude of force becomes double