Assertion: c's value | /r/HasProperty | calculated with less than 5% error
Facets:
Source sentences:
text: The distance between two such spots is half the wavelength of the microwaves; by measuring this distance and multiplying the wavelength by the microwave frequency (usually displayed on the back of the oven, typically 2450 MHz), the value of c can be calculated, "often with less than 5% error".