Physics paper 1

Question 1

what is the radius of an atom?

Answer 1

1 x 10^-10

Question 2

how could the energy levels of electrons change?

Answer 2

when the atoms absorbs or emits EM radiation.

Question 3

what does absorbing electromagnetic radiation do to an electron

Answer 3

moves it to a higher energy level further from the nucleus

Question 4

why would an atom emit EM radiation

Answer 4

electrons drop to a lower energy level

Question 5

structure of an alpha radiation

Answer 5

two neutrons and two protons same as a helium nucleus

Question 6

structure of beta radiation

Answer 6

high speed electron ejected from the nucleus as a neutron turns into a proton.

Question 7

structure of gamma radiation

Answer 7

electromagnetic radiation it is a wave

Question 8

difference between irradiation and contamination

Answer 8

irradiation is exposure to radiation while unwanted radioactive atoms getting on an object is contamination.

Question 9

two methods of energy transfer

Answer 9

mechanically and electrically