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.
If you were traveling at the speed of light (186,000 miles per second) then it would take you 20 years to travel 20 light years. A light-year is a measurement of the distance â¦that a beam of light would travel in a year. Modern interplanetary spacecraft can not travel anywhere near the speed of light, not even one percent of it! A beam of light would travel to from Earth to Pluto in around 6 hours.