Hi am not sure but have searched on online
<em>number of waves that pass a given point in one second is called <u>frequency..</u></em>
The heat from your hand causes the ice molecules to heat up and become more active. This lowers the stability of the ice cube compound causing it to melt.
Wavelength = (speed) / (frequency)
= (3 x 10⁸ m/s) / (1 x 10⁸ /s) = 3 meters