How Many of the Following Is/are Incorrect? I

question 1

Multiple Choice

How many of the following is/are incorrect? i.The importance of the equation E = mc² is that energy has mass.
Ii.Electromagnetic radiation can be thought of as a stream of particles called photons.
Iii.Electromagnetic radiation exhibits wave properties.
Iv.Energy can only occur in discrete units called quanta.

• A)0
• B)1
• C)2
• D)3
• E)4

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The hard, outer surface layer of a tooth that protects it from decay.