Idk I’m not smart like that
The frequency of the waves must decrease when the musician increases the wavelength without changing their speed. Your welcome

Actually Welcome to the Concept of the Ionic bonds.
Since Sodium (Na) is a cation and Chlorine (Cl) is a Anion, they both form a Ionic bond called as NaCl (common salt)
So answer is, Na and Cl
Http://www.geologyin.com/2014/11/how-to-identify-minerals-in-10-steps.html
Physical change can change a substance by affecting the form of a chemical change.
Examples of physical changes:
Something cut (Paper)
Molded (Bread)
Boiled (Water)
Mixed (Berries and strawberries)
HOPE THIS HELPS YOU! ^_^