The average Benchmark Human Services monthly salary ranges from approximately $1,500 per month for Licensed Practical Nurse to $1,500 per month for Licensed Practical Nurse.Salary information comes from 67 data points collected directly from employees, users, and jobs on Indeed.he average Benchmark Human Services monthly salary ranges from approximately $1,500 per month for Licensed Practical Nurse to $1,500 per month for Licensed Practical Nurse.
In a vacuum, all electromagnetic waves travel at approximately 3 x 108 m/s - the fastest speed possible. When electromagnetic waves travel through matter (for example, light through air or glass), they travel a bit slower than this but rarely less than half as fast as in a vacuum. The value for light travelling through an optical fibre, for example, is taken as 2 x 108 m/s.
Report Abuse. Here's a few differences: Electromagnetic waves travel at the speed of light, mechanical waves travel at or below the speed of sound in the medium through which they're traveling. Mechanical waves can only flow through matter, EM waves can travel through free space (and through matter, as well).EM waves are carried by photons, and therefore have some of the properties of particles, as well as the properties of waves.echanical waves can only flow through matter, EM waves can travel through free space (and through matter, as well). EM waves are carried by photons, and therefore have some of the properties of particles, as well as the properties of waves.