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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.
Answer
One benefit of making the lenses go dark with ultraviolet light is that ultraviolet (UV) rays can damage eyes. By darkening in response to UV exposure, the lenses protect the eyes from harm, such as cataracts or other issues related to UV damage.
Step 2
Radio waves from Jupiter take 40 minutes to reach Earth.
Answer
Since Jupiter is 5 times farther away from Earth compared to the distance of other commonly studied celestial bodies, radio waves and light waves travel at the same speed in space. This implies that all electromagnetic waves (EM waves) from Jupiter, including radio waves, take a significant amount of time to reach Earth.