What is the de Broglie wavelength of an electron moving at 2.2×10^6m/s​

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Which term best describes the form sound takes as it travels away from a drum (a- gas)(b-music) ( c-waves) (d-particles

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?