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.
There are two possible questions here. The first is simply how long would it take for a laser to travel to the moon and back. The moon is around 384,000 km away. The speed of light is 299,792,458 m/s. The journey is round trip, so: However,...