Two violinists, one directly behind the other, play for a listener directly in front of them. Both violinists sound concert A (440 Hz).
What is the smallest separation between the violinists that will produce destructive interference for the listener? Assume that the speed of sound is 343 m/s.

the answer for apex is the lowest

b.a device that inputs heat into a cool object

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.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods