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How do you read spectrograms?

Answer 1

see below

Above is the spectrum in spectrograph form of star M57.

Every star emits radiation at different wavelengths covering large portions of the entire light spectrum. That is what is depicted above.

The dark lines denote the presence of matter other than helium. The reason the lines are dark is that the emitted radiation has been absorbed by elements present in the star. This is important to astronomers in defining the type of a star they are observing and its relative age (old stars start producing elements beyond helium).

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Answer 2

Henry Asbill

A spectrogram is read by examining the signal's intensity at various frequencies over time; intensity is indicated by the spectrogram's darkness or color, while time is represented by the horizontal axis and frequency by the vertical axis.

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Answer from HIX Tutor

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.