Assertion: radio wave's range | /r/HasProperty | necessary
Facets:
value: in the case of quantum mechanics
type: OTHER
value: to produce a localized wave packet
type: PURPOSE
Source sentences:
text: It is well known from the theory of Fourier analysis, or from the Heisenberg uncertainty principle (in the case of quantum mechanics) that a narrow range of wavelengths is necessary to produce a localized wave packet, and the more localized the envelope, the larger the spread in required wavelengths.