query: Are electromagnetic waves a substance?
positive_passages.docid: 24556
positive_passages.text: What is a field, really?
negative_passages.docid: 158809
negative_passages.text: What is the status of massless photons traveling through a medium?
negative_passages.docid: 3785
negative_passages.text: What is the relation between electromagnetic wave and photon?
negative_passages.docid: 33395
negative_passages.text: What is the experimental evidence that light is an electromagnetic wave?
negative_passages.docid: 40148
negative_passages.text: Does light have mass?
negative_passages.docid: 26748
negative_passages.text: Why does matter exist in 3 states (liquids, solid, gas)?
negative_passages.docid: 74723
negative_passages.text: Popular depictions of electromagnetic wave: is there an error?
negative_passages.docid: 34350
negative_passages.text: matter wave and wave function
negative_passages.docid: 83467
negative_passages.text: If electromagnetic fields give charge to particles, do photons carry charge?
negative_passages.docid: 28177
negative_passages.text: What causes the permittivity and permeability of vacuum?
negative_passages.docid: 35085
negative_passages.text: If both radio waves and gamma rays can travel through walls
negative_passages.docid: 95153
negative_passages.text: Is the electromagnetic mass real?
negative_passages.docid: 140411
negative_passages.text: Is there a substance that doesn't reflect OR absorb light from the visible light spectrum?
negative_passages.docid: 30474
negative_passages.text: Why is light called an 'electromagnetic wave' if it's neither electric nor magnetic?
negative_passages.docid: 36000
negative_passages.text: Gravititonal fields compared to electromagnetic fields - are they infinite in range?
negative_passages.docid: 43436
negative_passages.text: What exactly is a photon?
negative_passages.docid: 135590
negative_passages.text: What is the magnitude of the force on a charged particle due to electromagnetic radiation?