Atube driven by a speaker displays resonances at 450 hz and 600 hz with no resonances in between. the fundamental frequency was found to be 150 hz. what are the boundary conditions on the tube?

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.

technology is the application of the knowledge gained by science.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.