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JulsSmile [24]
4 years ago
8

Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spe

ctrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude
Physics
2 answers:
never [62]4 years ago
5 0

Answer: we can conclude that the wavelength is decreasing. This means that the star is moving towards the observer on earth.

Explanation:

Since light has a constant speed of 3 x 10^8m/s, and this speed is a product of its wavelength and its frequency c = f¥

Where f is the frequency and ¥ is the wavelnght.

For a decreasing wavelength, it is seen that the frequency is increasing.

According to the doppler's effect, a moving body that is a source of a wave of frequency f, moving relatively towards an observer, the frequency will increase as they move closer to a frequency f' which is greater than f. This is known as the doppler shift of light wave.

belka [17]4 years ago
4 0

Answer:

It means that the star is moving towards us.

Explanation:

The star is moving toward us; shift to a shorter wavelength. A shorter wavelength means a shift to the blue end of the spectrum (a blueshift) so that the object is moving toward us.

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Answer:

All electrons are negative(-) charged

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A car travel with a constant velocity of 20.5m/s for 20seconds what distance does it cover in this time ?​
prohojiy [21]

Answer:

410 m

Explanation:

Given:

v₀ = 20.5 m/s

a = 0 m/s²

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Δx = (20.5 m/s) (20 s) + ½ (0 m/s²) (20 s)²

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Answer:

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Let x represent the distance travelled by the plane. Hence:

x² = 100² + 220²

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x = 241.66 km

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