All about the name Prem: Meaning, origin, and popularity of Prem. What does Prem mean? Click for more information about the name Prem and thousands of other baby names. All about the name Prem: Meaning, origin, and popularity of Prem.
Train crews may also sound their horns when there is a vehicle, person, or animal on or near the track, and the crew determines it is appropriate to provide warning. Crews may also sound the horn when. there are track or construction workers within 25 feet of a live track, or when gates and lights at the.
The frequency of most dog whistles is within the range of 23 to 54 kHz, so they are above the range of human hearing, although some are adjustable down into the audible range. To human ears, a dog whistle makes only a quiet hissing sound. The advantage of the dog whistle is that it doesn't produce a loud irritating noise for humans that a normal whistle would produce, so it can be used to train or command animals without disturbing nearby people.