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9 (a) Some sunglasses have photochromic lenses - Edexcel - GCSE Physics - Question 9 - 2019 - Paper 1
Question 9
9 (a) Some sunglasses have photochromic lenses. Photochromic lenses are clear when the lenses are indoors but they darken in bright sunlight to reduce the effects o... show full transcript
Worked Solution & Example Answer:9 (a) Some sunglasses have photochromic lenses - Edexcel - GCSE Physics - Question 9 - 2019 - Paper 1
Step 1
Suggest a benefit of making the lenses go dark with ultraviolet light.
Answer
One benefit of making photochromic lenses go dark when exposed to ultraviolet light is that they help protect the eyes from harmful UV rays. By darkening, they reduce glare and strain on the eyes while outdoors, providing comfort and improving visibility in bright conditions.
Step 2
Calculate how many times further it is from Earth to Jupiter than from Earth to the Sun.
Answer
To calculate the difference in distance based on the time it takes for the respective waves to reach Earth, use the following information:
- Time taken for radio waves from Jupiter: 40 minutes
- Time taken for light waves from the Sun: 8 minutes
We can use the formula:
ext{Distance} ext{(D)} = ext{Speed} imes ext{Time}
Since light travels faster than radio waves (but we are not specifically calculating distance in this case), we can equate the time taken to determine the ratio:
The distance ratio is given by:
rac{40 ext{ minutes}}{8 ext{ minutes}} = 5
Thus, it is 5 times further from Earth to Jupiter than from Earth to the Sun.
Step 3