Quick questions on The electromagnetic spectrum and Maxwell's equations: HSC Physics Module 7

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are maxwell's equations, in words?

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By 1865, James Clerk Maxwell had combined four laws of electromagnetism into a self-consistent set:

What is q1?

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List the seven main bands of the electromagnetic spectrum in order of increasing frequency. [2 marks]

What is q2?

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A laser pointer emits red light at

\lambda = 650 \text{ nm}

. Calculate (a) the frequency and (b) the photon energy in eV. [3 marks]

What is q3?

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Maxwell's equations predict EM waves travel at

c = 1 / \sqrt{\mu_0 \varepsilon_0}

in vacuum. (a) Calculate

c

from

\mu_0 = 4\pi \times 10^{-7} \text{ T m/A}

and

\varepsilon_0 = 8.85 \times 10^{-12} \text{ F/m}

. (b) Explain how this prediction identified light as an electromagnetic wave.

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