"What is the speed of light?"
Translation:Wat is de snelheid van het licht?
So can we use 'wat' to ask the value of a quantity as in English? In that case could this sentence also be translated in the context of 'What is [this thing called] the speed of light?' rather than 'What is [the value] of the speed of light' ?
Late reply, I guess if I want to ask for the definition of 'speed of light' I would ask: "Wat is lichtsnelheid?" Taking the 'de' away, makes the question suitable for asking for the definition.