Question

# Matter waves are:A. Electromagnetic waves B. Matter wavesC. Either mechanical or electromagneticD. Neither mechanical nor electromagnetic

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Hint: It is a wave related to particles revolving in an atom around the nucleus. De Broglie named these waves as matter waves or De Broglie's waves. Its wavelength is calculated from
wavelength $\lambda = \dfrac{h}{{mv}}$,
where h is planck constant. This theory mainly conveys the wave nature of light having energy given by plank E=h$\upsilon$. ($\upsilon$ is frequency of radiation). These waves do not require any material medium for its propagation. It is coming in mainly non relativistic theory.