Our technological and engineering powers are as yet nowhere near powerful enough

Question

Our technological and engineering powers are as yet nowhere near powerful enough to travel to even the nearest star. How do we know what stars are made of we don't indirect reasoning from general physical theory the spectral lines of the starlight tell us what kind of atoms are in and around the star gravity waves from the stars tell us The light generated by a laser is very intense and stays in a narrow beam over great distances because: laser light is incoherent laser light shows destructive interference laser light is coherent laser light is generally a mix of colors

Explanation / Answer

13) C

Each element on the periodic table gives off a unique pattern of colors - like a hidden fingerprint. Astronomers read the color patterns in starlight to determine the elements present in the star.

Astronomers pass starlight through their telescopes into a spectrometer to separate the light into a spectrum - a rainbow of its component colors.

14) C

The light from a laser is said to be coherent, which means the wavelengths of the laser light are in phase in space and time

The light emitted from a laser is monochromatic, that is, it is of one wavelength (color)

Lasers emit light that is highly directional.  Laser light is emitted as a relatively narrow beam in a specific direction.

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