Chapter 11, Problem 11.13E

(a) For a pendulum having classical frequency of $1.00{\text{s}}^{-1}$, what is the energy difference in $\text{J}$ between quantized energy levels? (b) Calculate the wavelength of light that must be absorbed in order for the pendulum to go from one level to another. (c) Can you determine in what region of the electromagnetic spectrum such a wavelength belongs? (d) Comment on your results for parts a and b based on your knowledge of the state of science in early twentieth century. Why wasn’t the quantum mechanical behavior of nature noticed?