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 is an electromagnetic wave and travels at a speed roughly 3 x 10^8 meters/second(m/s) in a vacuum. Since distance = speed*time the time it takes for the laser pulse to travel from the the earth to the moon is, time = distance/speed.For round trip time = 2*(distance/speed).oughly 2.5 seconds. Let's do the math: The average distance between the moon's surface and the earth's surface is 380,500 kilometers(km). Light is an electromagnetic wave an â¦ d travels at a speed roughly 3 x 10^8 meters/second(m/s) in a vacuum.