What of the following distance methods is used to determine the distance to the most distant galaxies?

a. radar echo
b. supernova observations
c. period-luminosity relationship of variable stars
d. parallax


b

Physics & Space Science

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Explain the basic principle behind the VLA

What will be an ideal response?

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A light beam shines through a thin slit and illuminates a distant screen. The central bright fringe on the screen is 1.00 cm wide, as measured between the dark fringes that border it on either side

Which of the following actions would decrease the width of the central bright fringe? (There may be more than one correct choice.) A) increase the wavelength of the light B) decrease the wavelength of the light C) increase the width of the slit D) decrease the width of the slit E) put the apparatus all under water

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A common electromagnet consists of a

A) bar magnet that carries an electric current. B) current-carrying wire coil. C) current-carrying coil with a piece of iron inside.

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Carbonaceous meteorites contain organic molecules, even amino acids

Indicate whether the statement is true or false

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