Spectral Lines - Class 10 Review

These flashcards are designed to help students review key concepts and information about spectral lines from their AST101 lecture.

What is scattering in terms of light?

Scattering is reflection in all directions.

What happens to light when it is absorbed by black objects?

All colors of light are absorbed.

How does a prism affect light?

The prism bends light differently for each color, revealing a spectrum.

What is the relationship between wave speed, frequency, and wavelength?

The speed of a wave is its frequency times its wavelength, S = fL.

What does the wavelength of light determine?

It determines the color of the light.

What type of radiation do hot objects emit?

Hot objects emit thermal radiation that glows.

What are emission lines?

Distinct colors of light emitted by low-pressure gas when electrically excited.

What are the basic energy level transitions for electrons in the Bohr model?

Electrons can shift between energy levels, emitting or absorbing light of specific frequencies.

What happens when white light shines on an atom?

Light of a specific frequency can be absorbed, causing the electron to move to a higher orbital.

What is the significance of emission and absorption lines in spectra?

Both can be used as chemical fingerprints to identify different elements.

What effect does temperature have on emission spectra?

Hotter things have a brighter spectrum, peaking at shorter wavelengths.

What does redshift indicate about an object's movement?

Redshift indicates that the object is moving away from the observer.

How does the Doppler effect apply to light?

If a light source is moving closer, it shifts to a higher frequency (blueshift); if moving away, it shifts to a lower frequency (redshift).

Why are spectra from space considered to be messy?

They contain emission and absorption lines from multiple elements combined with a continuum spectrum.

What indicates the presence of gases in a spectrum?

Absorption lines indicate cooler gases, while emission lines indicate warmer gases.