- A frequency of radient energy means a form of radient energy
- All ranges of frequencies of radiant energy is called electromagnetic spectrum
- Therefore, all ranges of forms of radient energy is called the electromagnetic spectrum

Hence, all ranges of forms of radient energy is called the electromagnetic spectrum
Question: The range of all forms of radiant energy is called the
Context: - A frequency of radient energy means a form of radient energy 
- All ranges of frequencies of radiant energy is called electromagnetic spectrum