Sun ki harmful rays se kaise bachen

Atomspheric layer protective to living beings from harmful rays is

Atmospheric layer protective to living beings from harmful rays is

If a child's development is damaged by subjecting embryo to harmful radiation rays then it is considered as which influencing factor of growth and development?

Glass ki help se paper ko kaise jala sakte hai

Glass ki help se Paper ko kaise jala sakte hai jaaniye Doubtnut ke Sath

#WinnersTalk - ₹10,000 ke vijayta Abhishek Tiwari se suniye kaise Prize amount ne ki unki madad :D

Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. For example, if you apply sunscreen with SPF 15, you get 1 minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claim that the sunscreen blocks about 97% of harmful UV rays. Assuming the SPF factor is accurate, is this claim true? Explain.