Universe & Redshift/blueshift

Front

What is Redshift?

Back

Redshift is the phenomenon where light from an object moving away from an observer is shifted to longer wavelengths, indicating that the object is receding.

Front

What is Blueshift?

Back

Blueshift is the phenomenon where light from an object moving towards an observer is shifted to shorter wavelengths, indicating that the object is approaching.

Front

What does the absorption spectrum of a star indicate?

Back

The absorption spectrum of a star shows the specific wavelengths of light absorbed by elements in the star's atmosphere, revealing its composition and motion relative to Earth.

Front

What is the relationship between wavelength and frequency?

Back

Wavelength and frequency are inversely related; as the wavelength increases, the frequency decreases, and vice versa.

Front

Which type of electromagnetic wave has the longest wavelength?

Back

Radio Waves have the longest wavelength and the lowest frequency/energy.

Front

How does the energy of an electromagnetic wave relate to its frequency?

Back

The energy of an electromagnetic wave increases as its frequency increases.

Front

What happens to the absorption spectrum of a star moving towards Earth?

Back

The absorption lines in the spectrum shift towards the blue end of the spectrum, indicating a blueshift.

Front

What happens to the absorption spectrum of a star moving away from Earth?

Back

The absorption lines in the spectrum shift towards the red end of the spectrum, indicating a redshift.

Front

What is the significance of the Doppler Effect in astronomy?

Back

The Doppler Effect helps astronomers determine the motion of stars and galaxies relative to Earth based on the shift in their spectral lines.

Front

Define 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.