Musical instruments (normally) vibrate in the sfundamental state. To change the frequency ( and therefore the note) from a guitar string, the player will pin the strings down to force nodes in different places, thereby changing the wavelength. Piano wires are struck with a hammer and produce only one note each. The piano itself has a fixed size and filling it with wires of varying lengths up to several meters long is not feasible. What is different about each piano wire to allow them to have different resonant frequencies?

the answer is b, have negligible mass

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.