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Video Field Trip: Fireball

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Presentation on theme: "Video Field Trip: Fireball"— Presentation transcript:

1 Video Field Trip: Fireball
How did scientists discover the activity of the sun’s core? How do auroras occur?

2 The Study of Light Chapter 24, Section 1

3 Electromagnetic Radiation
Electromagnetic radiation includes gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves Electromagnetic Spectrum – the arrangement of electromagnetic radiation according to wavelength All energy, regardless of wavelength, travels through the vacuum of space at the speed of light (300,000 km/s) Light has a dual nature, it is both a wave and a particle Each color of light has a specific wavelength (with red having the longest and violet having the shortest) Photon – a small packet of light energy Shorter wavelengths have more energetic photons

4 Electromagnetic Spectrum

5 Spectrum of Light


7 Concept Development What are photons?

8 Spectroscopy Spectroscopy – the study of the properties of light that depend on wavelength Continuous Spectrum – an uninterrupted band of light emitted by an incandescent solid, liquid, or gas under pressure Absorption Spectrum – a continuous spectrum produced when white light is passed through a cool gas under low pressure; the gas absorbs selected wavelengths of light, and the spectrum looks like it has dark lines superimposed Emission Spectrum – a series of bright lines of particular wavelengths produced by a hot gas under low pressure When the spectrum of a star is studied, the spectral lines act as “fingerprints” These lines identify the elements present and thus the star’s chemical composition

9 Three Types of Spectra

10 Solar Spectrum

11 Concept Check Compare and contrast the three different types of spectra.

12 The Doppler Effect Doppler Effect – the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer The light from a source that is moving away from an observer appears redder than it actually is because its waves are lengthened (red-shift) This effect is only visible to the human eye when objects are moving close to the speed of light In astronomy, the Doppler effect is used to determine whether a star or other body in space is moving away from or toward Earth Large Doppler shifts indicate higher speeds; smaller Doppler shifts indicate slower speeds

13 The Doppler Effect

14 Measurement of Doppler Shifts

15 Concept Check How can scientists determine whether a star is moving toward or away from Earth?

16 Assignment Read Chapter 24, Section 1 (pg. 674-677)
Do Chapter 24 Assessment #1-34 (pg )

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