Absorption and Emission Spectra

Front

What is an absorption spectrum?

Back

An absorption spectrum is a spectrum of absorbed light, showing dark lines or bands where specific wavelengths of light have been absorbed by a substance, typically a gas or a liquid.

Front

What is an emission spectrum?

Back

An emission spectrum is a spectrum of emitted light from a substance, showing bright lines or bands at specific wavelengths where the substance emits light.

Front

What causes absorption lines in a spectrum?

Back

Absorption lines are caused by atoms or molecules absorbing specific wavelengths of light, which correspond to the energy differences between their electronic states.

Front

What is the Doppler effect in relation to light?

Back

The Doppler effect refers to the change in frequency or wavelength of light from an object moving relative to an observer, causing redshift (moving away) or blueshift (moving closer).

Front

What does redshift indicate about a star's movement?

Back

Redshift indicates that a star is moving away from the observer, resulting in longer wavelengths of light.

Front

What does blueshift indicate about a star's movement?

Back

Blueshift indicates that a star is moving towards the observer, resulting in shorter wavelengths of light.

Front

What is the relationship between wavelength and frequency?

Back

Longer wavelength = lower frequency; shorter wavelength = higher frequency.

Front

What is the electromagnetic spectrum?

Back

The electromagnetic spectrum is the range of all types of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

What is the largest generator of gamma rays?

Back

The universe is the largest generator of gamma rays, produced by high-energy processes such as supernovae and black hole interactions.

Front

How can scientists identify elements in a gas mixture?

Back

Scientists can identify elements in a gas mixture by analyzing the emission or absorption spectrum of the light emitted or absorbed by the gases.