When playing a musical instrument, the amplitude, frequency, and wavelength of sound waves can change. Which statements about energy and sound waves are correct? I. The energy of a sound wave is proportional to its amplitude.
II. The energy of a sound wave is proportional to its frequency
III. When volume increases, the energy transmitted by the sound wave increases. IV. When wavelength increases, the energy transmitted by the sound wave increases.

A:I, II, AND IV
B:I, II , AND III
C:I, III, AND IV
D:II, III, AND IV​

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

How does a noncompetitive inhibitor reduce an enzyme’s activity?