Answer: Sunburn and skin cancer (damages DNA), also synthesizes vitamin D.
- A Sunburn and skin cancer (damages DNA), also synthesizes vitamin D
- B Synthesizing vitamin D in skin with little other biological effect
- C Passing through skin largely with little measurable biological effect
- D Producing a tan with little deeper cellular or DNA-level damage
Correct answer: A. Sunburn and skin cancer (damages DNA), also synthesizes vitamin D
Explanation: UV radiation (especially UVB and UVC) can damage DNA, causing sunburn and increasing skin cancer risk. However, UVB also triggers vitamin D synthesis in the skin.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.