<Dd> <Table> <Tr> <Td> <P> ∇ 2 E = μ 0 ε 0 ∂ 2 E ∂ t 2 (\ displaystyle \ nabla ^ (2) \ mathbf (E) = \ mu _ (0) \ epsilon _ (0) (\ frac (\ partial ^ (2) \ mathbf (E)) (\ partial t ^ (2)))) </P> </Td> </Tr> </Table> </Dd> <Table> <Tr> <Td> <P> ∇ 2 E = μ 0 ε 0 ∂ 2 E ∂ t 2 (\ displaystyle \ nabla ^ (2) \ mathbf (E) = \ mu _ (0) \ epsilon _ (0) (\ frac (\ partial ^ (2) \ mathbf (E)) (\ partial t ^ (2)))) </P> </Td> </Tr> </Table> <Tr> <Td> <P> ∇ 2 E = μ 0 ε 0 ∂ 2 E ∂ t 2 (\ displaystyle \ nabla ^ (2) \ mathbf (E) = \ mu _ (0) \ epsilon _ (0) (\ frac (\ partial ^ (2) \ mathbf (E)) (\ partial t ^ (2)))) </P> </Td> </Tr> <P> ∇ 2 E = μ 0 ε 0 ∂ 2 E ∂ t 2 (\ displaystyle \ nabla ^ (2) \ mathbf (E) = \ mu _ (0) \ epsilon _ (0) (\ frac (\ partial ^ (2) \ mathbf (E)) (\ partial t ^ (2)))) </P>

What two models explain the properties of electromagnetic waves