Microwaves

2 marks · Easy

Explain one possible detrimental effect of excessive exposure to microwaves on the human body. Suggest one way to reduce the risk.

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Excessive exposure to microwaves can heat living tissue and cause burns (or damage). Limiting exposure time or using proper shields/metal screens can reduce the risk.

Must show: harmful effect (heating/burns), protective measure (e.g. shielding, limiting exposure)

Also accept: Mentions of damage to body tissue

Common mistakes: Stating general effects without linking to microwaves; Suggesting inappropriate protective measures

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Identifies a valid detrimental effect (e.g. heating or burns of tissue).

B2 · 1 mark · Suggests a reasonable method to reduce or prevent exposure (e.g. shielding, screens, limiting exposure time).

Worked solution

Excessive exposure to microwaves can heat body tissue, causing burns or damage. To reduce the risk, people should use shielding such as metal screens and avoid spending lots of time near sources of microwaves.