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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Making the lenses go dark with ultraviolet (UV) light protects the eyes from damage caused by harmful UV rays. This can help prevent eye conditions such as cataracts and reduce discomfort in bright sunlight.
Step 2
Radio waves from Jupiter take 40 minutes to reach Earth.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This indicates that Jupiter is 5 times farther away than the distance light travels in the same amount of time. Additionally, radio waves and light waves travel at the same speed in space, which is the speed of light.
