A wave has a wavelength of 50 m and a speed of 200 m/s. What is the frequency of this wave in hertz?

freq= 200/50= 4 Hz

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

c) up is the direction the magnetic force is acting on the charge.