de Broglie's Quantum Equations
"When you can measure what you are speaking about and express it in numbers, you know something about it"  Lord Kelvin ( 1824  1907 )
§ Listen to short excerpt "What is matter?", by Erwin Schrödinger, 1952 :
"We no longer contrast matter with forces and field of force as different entities, we know now that these concepts have to be merged. It is true, we call a spatial region free of matter, call it empty if there is nothing but a gravitational field. But space is never really empty because even far away in the universe there is starlight, and that is matter [ ... ]"
source: Erwin Schrödinger, 1952 Audio  document from the lecture "Was ist Materie?" English translation: taken from the lecture "Our Conception of Matter" given in 1952 organized by Rencontres Internationales de Genève, Geneva, Switzerland
§ de Broglie's Quantum Equation:
Examples of Determining de Broglie's Wavelength^{∗}
Problem 1: Find the de Broglie wavelength of a wave  particle whose total energy,
is .
Solution:
Problem 2: Find the de Broglie wavelength of earth whose rest or proper mass is .
Solution:
^{∗}
note: some of these examples are used in the future upcoming Relativity Physics and Science Calculator Mac application for de Broglie's quantum equations.
§ References:
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