# How do we know about the sun interior?

By using mathematical models from what we can measure and observe from the surface.

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Helioseismology, the study of solar oscillations or seismic waves to infer properties and structures inside the Sun, is how we investigate its interior.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- What is plasma? How is it formed in stars and other celestial bodies?
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- What is studied in helioseismology?
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- Calculate energy of transition from n=3 to n=1. What region of electromagnetic spectrum is this radiation found?

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