Discribe two differences between medeleevs periodic table and modern periodic table

Anybody wanna ? (picture included? )

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.