Advertisements
Advertisements
प्रश्न
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 claims that the sunscreen blocks about 97% of harmful UV rays. Assuming the SPF factor is accurate, is this claim true? Explain.
उत्तर
False,
According to the claim, for `3/100` affect of UV rays
1 minute = `33 1/3` SPF
Affect ≠ 30 SPF claim
APPEARS IN
संबंधित प्रश्न
An alloy of tin and copper consists of 15 parts of tin and 105 parts of copper. Find the percentage of copper in the alloy?
Find the percentage change, when a number is changed from :
80 to 100
What percent is: 40 paisa of Rs. 2?
Mrs. Sharma went to the market with ₹ 800 in her purse. When she returned to her home, ₹ 240 was still left in her purse. What percent of her money did she spend in the market?
A number when increased by 18% gives 236. Find the number
15% of 25% of 10000 = ___________
In Delhi University, in the year 2009 – 10,49,000 seats were available for admission to various courses at graduation level. Out of these 28,200 seats were for the students of General Category while 7,400 seats were reserved for SC and 3,700 seats for ST. Find the percentage of seats available for students of SC Category and ST Category taken together.
Madhu’s room measures 6 m × 3 m. Her carpet covers 8 m2. What per cent of floor is covered by the carpet?
30% of ₹ 360 = ______.
Out of 600 students of a school, 126 go for a picnic. The percentage of students that did not go for the picnic is 75.
