Some sunglasses have photochromic lenses - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1
Question 6
Some sunglasses have photochromic lenses.
Photochromic lenses are clear when the lenses are indoors but they darken in bright sunlight to reduce the effects of the ... show full transcript
Worked Solution & Example Answer:Some sunglasses have photochromic lenses - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1
Step 1
Suggest a benefit of making the lenses go dark with ultraviolet light.
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Answer
One benefit of photochromic lenses going dark in response to ultraviolet (UV) light is that UV rays are harmful to the eyes. By darkening, these lenses provide protection against UV damage, which can help prevent cataracts and other eye-related conditions.
Step 2
Radio waves from Jupiter take 40 minutes to reach Earth.
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Answer
Jupiter is 5 times farther away than other sources of electromagnetic waves. Radio waves and light waves travel at the same speed (in space), so it takes 40 minutes for the radio waves from Jupiter to reach Earth.
