The reason behind the difference in the variability between x ray and visible radiation , if the amount of visible light emitted by the Sun varies only a little over 11 -year sunspot cycle. But, the number of x rays emitted by the Sun can be 10 times greater at solar maximum than at solar minimum. These two types of radiation should be so different in their variability.

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Chapter 16, Problem 50Q

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To explain: The reason behind the difference in the variability between x ray and visible radiation, if the amount of visible light emitted by the Sun varies only a little over 11-year sunspot cycle. But, the number of x rays emitted by the Sun can be 10 times greater at solar maximum than at solar minimum. These two types of radiation should be so different in their variability.

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