Which of the following is not true of electromagnetic energy? It can travel thro

Question

Which of the following is not true of electromagnetic energy?

It can travel through empty space

All wavelengths of electromagnetic energy travel at the same speed

The visible portion of the spectrum comprises only a small part of the total range of electromagnetic energy

The wavelength generated is directly proportional to the temperature of the emitter - e.g. as the temperature of the emitting object increases, the wavelength also increases

The hotter an object is, the more energy it emits at all wavelengths

Explanation / Answer

The statement "The wavelength generated is directly proportional to the temperature of the emitter - e.g. as the temperature of the emitting object increases, the wavelength also increases" is not true. Wien's displacement law states that for different temperatures peaks at a wavelength inversely proportional to the temperature.

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