text: A scientist with this surname names the cone-shaped propagation of force produced by a bullet enteringglass.
full_question: A scientist with this surname names the cone-shaped propagation of force produced by a bullet enteringglass. Another scientist with this surname is the alphabetically last of two scientists who discovered thatelectrons colliding with a thin layer of mercury atoms either lost 4.9 electron volts of kinetic energy or nokinetic energy at all. That scientist, Gustav, was the brother of the inventor of the dipole antenna, which wasused to show that electromagnetic waves obeyed Maxwell's equations. A scientist with this surname noticedthat electrodes sparked more when surrounded by ultraviolet light, discovering the photoelectric effect. For 10points, give this last name of Heinrich, the scientist who names the SI unit of frequency. 
first_sentence: A scientist with this surname names the cone-shaped propagation of force produced by a bullet enteringglass.
raw_answer: Hertz