1 Place the cotton balls in areas where mice are likely to enter your house, by doorways or heat vents, etc. 2  Another helpful deterrent is to grow peppermint plants near the entryways. 3  You can use the mint in cooking as well as it serving a deterrent purpose.
Nov 12, 2015. 20 kilometers (12 miles) for a 1 milliwatt beam. Laser light can travel 20 kilometers (12 miles) per-milliwatt that is contained within the laser.
Light travels at 300,000 kilometers per second, and the distance it travels in a single year is 9,460,730,472,580.8 kilometers. Thatâs a light year. So, for example, the star Alpha Centauri is 4.467 light years away from us, so a beam of light would take 4.467 years to get from Earth to Alpha Centauri.