Dangers of electromagnetic waves

Question 1

Some EM radiation can be harmful to people

Answer 1

1) When EM waves enter living tissue, they usually pass through without being absorbed e.g. radio waves
2) Other types of radiation are absorbed and cause the heating of cells e.g. microwaves
3) Some radiations can cause cancerous changes in living cells e.g. gamma rays can cause cancer

Question 2

Higher frequency radiation is usually more dangerous

Answer 2

Microwaves heat body tissue internally, infrared waves can cause skin burns, ultraviolet radiation damage surface cells/cause blindness, and gamma radiation can cause cell mutations/tissue damage/cancer