Wednesday 1st May 2024
    Difficulty: Hard

    Lasers (Quiz #530)

    Photo by <a href="https://unsplash.com/@abrizgalov?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Artem Bryzgalov</a>
    Photo by Artem Bryzgalov (Unsplash)

    1. What does the S in "laser" stand for?

    2. Lasers are usually labelled with a safety class number, which identifies how dangerous the laser is. Which of these is the safest?

    3. Lasers are used to measure the distance between the Earth and the Moon. What is the precision of these measurements?

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