Skincare Sun Protection and SPF 1 — Questions and Answers
Question 1: What does SPF stand for in sunscreen products?
- Sun Protection Frequency
- Skin Protection Formula
- Sun Protection Factor (Correct answer)
- Solar Penetration Filter
Correct answer: Sun Protection Factor
SPF stands for Sun Protection Factor and measures how well a sunscreen protects against UVB radiation that causes sunburn.
Question 2: What type of UV radiation is most responsible for causing sunburn?
- UVA rays
- UVB rays (Correct answer)
- UVC rays
- Infrared rays
Correct answer: UVB rays
UVB rays have shorter wavelengths that penetrate the epidermis and are the primary cause of sunburn and surface skin damage.
Question 3: Which type of UV rays are associated with premature skin aging and can penetrate glass?
- UVB rays
- UVC rays
- UVA rays (Correct answer)
- Infrared radiation
Correct answer: UVA rays
UVA rays penetrate deep into the dermis and are associated with photoaging, wrinkles, and pigmentation changes; they also pass through glass.
Question 4: What does 'broad-spectrum' sunscreen mean?
- It has an SPF of 50 or higher
- It protects against both UVA and UVB rays (Correct answer)
- It contains both chemical and physical filters
- It provides 24-hour protection
Correct answer: It protects against both UVA and UVB rays
Broad-spectrum sunscreens protect against both UVA (aging) and UVB (burning) rays, offering comprehensive UV protection.
Question 5: According to the American Academy of Dermatology, what is the minimum recommended SPF for daily use?
- SPF 10
- SPF 15
- SPF 30 (Correct answer)
- SPF 50
Correct answer: SPF 30
The AAD recommends a minimum of SPF 30 for daily use, which blocks approximately 97% of UVB rays.
Question 6: How often should sunscreen be reapplied during outdoor activities?
- Once in the morning is sufficient
- Every 4–6 hours
- Every 2 hours, or after swimming or sweating (Correct answer)
- Only when you feel it wearing off
Correct answer: Every 2 hours, or after swimming or sweating
Sunscreen should be reapplied every 2 hours and immediately after swimming or excessive sweating to maintain protection.
Skincare Sun Protection and SPF 1
What does SPF stand for in sunscreen products?