radiowaves and dangers of em waves

Question 1

how are radiowaves produced?

Answer 1

when electrons oscillate in electrical circuits

Question 2

what happens when radiowaves are absorbed?

Answer 2

they create an alternating current, with the same frequency as the radiowave

Question 3

what happens when em waves are generated or absorbed?

Answer 3

changes to the atom or nuclei take place

Question 4

what are the 2 ways of generating em waves?

Answer 4

heating atoms or a change to the nucleus

Question 5

how does heating an atom generate an em wave?

Answer 5

when we heat atoms, we cause electrons to move to a higher energy level, when this electron returns to original level, it generates an em wave

Question 6

gamma rays can be emitted from _____ of an atom?

Answer 6

gamma rays can be emitted from nucleus of an atom

Question 7

once gamma ray has been emitted, the nucleus has ___ energy then it had at the start?

Answer 7

once gamma ray has been emitted, the nucleus has less energy then it had at the start

Question 8

what can em waves be emitted and absorbed over?

Answer 8

em waves can be emitted and absorbed over a wide frequency range from radiowaves to gamma rays

Question 9

what is the risk of uv rays?

Answer 9

exposure to uv rays increases risk of skin cancer and can cause skin to age prematurely

Question 10

what is the risk of x-rays and gamma rays?

Answer 10

they are ionising radiation, which means they can knock off atoms when they’re absorbed, this can cause mutations and increase risk of cancer

Question 11

what 2 things does damage done by radiation depend on?

Answer 11

type of radiation and dose of radiation