Which of the following statements about noncovalent bonding interactions is not true?

van der waals interactions, also known as dispersion forces, are the weakest of the attractive noncovalent bonding interactions.
charge-induced dipole interactions are inversely proportional to the square of the distance between the two atoms.
a charge may induce formation of a dipole in a nearby polarizable molecule.
all noncovalent bond interactions are inherently electrostatic in nature.

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz