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Yuki888 [10]
3 years ago
13

Laboratory experiments here on Earth have determined that each element in the periodic table emits photons only at certain wavel

engths. These photons are apparent to astronomers as either emission or absorption lines in the spectrum of an astronomical object, like stars in galaxies. Astronomers can, by measuring the position of these spectral lines, determine which elements are present in the star itself or along the line of sight. When astronomers perform this analysis, they note that for most astronomical bodies, the observed spectral lines are all shifted to longer (redder) wavelengths. This is known as cosmological redshift and is analogous to the Doppler redshift. What does this redshift indicate to us about the universe in general?
A) The age of the universe.
B) The universe is expanding.
C) How much longer the universe should exist.
D) The universe is contracting into a black hole.
Physics
1 answer:
Bogdan [553]3 years ago
4 0

Answer: answer is B

Explanation:

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Answer:

540m/s

Explanation:

Given parameters:

Frequency of the wave = 18000Hz

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Now insert the given parameters and solve;

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3 years ago
A train travels at a speed of 30 m/s. The train starts at an initial position of 1000 meters and travels for 30 seconds. What is
torisob [31]

Answer:

1900 metres

Explanation:

Given that a train travels at a speed of 30 m/s. The train starts at an initial position of 1000 meters and travels for 30 seconds.

The parameters to be considered are:

Speed = 30 m/s

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Speed = distance/time

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6 0
3 years ago
Please please answer this! explain the kinetic molecular theory ( i don't understand how they explain it in my lesson so if some
Bess [88]

Answer:

Explanation:

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