What Causes The Dark Bands Observed In A Solar Spectrum

What Causes The Dark Bands Observed In A Solar Spectrum?

It was correctly deduced that dark lines in the solar spectrum are caused by absorption by chemical elements in the solar atmosphere. Some of the observed features were identified as telluric lines originating from absorption by oxygen molecules in the Earth’s atmosphere.

What causes the dark bands observed in solar and stellar spectrum?

Fraunhofer lines in astronomical spectroscopy any of the dark (absorption) lines in the spectrum of the Sun or other star caused by selective absorption of the Sun’s or star’s radiation at specific wavelengths by the various elements existing as gases in its atmosphere.

Which planet has composition and density similar to the Sun?

Venus is a terrestrial planet and is sometimes called Earth’s “sister planet” because of their similar size mass proximity to the Sun and bulk composition.

What is an apparent shift in position caused by the motion of the observer?

parallax. The apparent shift in a star’s position caused by the motion of the observer.

What is a star that is gravitationally bound to another star?

A star system or stellar system is a small number of stars that orbit each other bound by gravitational attraction. A large group of stars bound by gravitation is generally called a star cluster or galaxy although broadly speaking they are also star systems.

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What does a dark line or dark area in a spectrum mean?

When we see dark lines in a spectrum they correspond to certain wavelengths being missing due to absorption by matter (in the form of atoms/molecules) on their way. So the dark line represents “absence of light” in a spectrum not any particular wavelength (color) of light.

Which of the following causes for dark lines in the spectrum that results from white light passing through a cloud of a gaseous substance?

Emission lines refer to the fact that glowing hot gas emits lines of light whereas absorption lines refer to the tendency of cool atmospheric gas to absorb the same lines of light. When light passes through gas in the atmosphere some of the light at particular wavelengths is scattered resulting in darker bands.

Is Uranus bigger than Neptune?

Uranus is slightly larger in diameter than its neighbor Neptune yet smaller in mass.

How do scientists use spectra to identify the elements in the Sun’s outer layer?

How do scientists use spectra to identify the elements in the Sun’s outer layer? Different chemical elements emit (or absorb) certain specific frequencies of light. 12. What information can plotting a star on the graph of an H-R Diagram tell us about a star?

Which planet has longest day?


‘ It was already known that Venus has the longest day – the time the planet takes for a single rotation on its axis – of any planet in our solar system though there were discrepancies among previous estimates. The study found that a single Venusian rotation takes 243.0226 Earth days.

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What causes apparent motion?

The rotation of the Earth on its axis causes all objects to appear to move around the sky once each day. The apparent motion of a star to an observer which arises from the Earth’s rotation depends on the location of the observer on Earth and the location of the star relative to Earth’s rotation axis.

What causes the apparent motion of the sun and stars?

The apparent motion of the sun caused by the rotation of the Earth about its axis changes the angle at which the direct component of light will strike the Earth. From a fixed location on Earth the sun appears to move throughout the sky.

What caused the apparent change in position of the dots of light for each star?

Although the stars move across the sky they stay in the same patterns. This is because the apparent nightly motion of the stars is actually caused by the rotation of Earth on its axis. The patterns also shift in the sky with the seasons as Earth revolves around the Sun.

Can you see binary stars with the naked eye?

The only (possible) case of “binary star” whose two components are separately visible to the naked eye is the case of Mizar and Alcor (though actually a multiple-star system) but it is not known for sure whether Mizar and Alcor are gravitationally bound. …

Are there 3 star systems?

Three-star systems are uncommon but not rare. NASA estimates that around 10 percent of the roughly 7 billion star systems in our galaxy have three stars. … They found the system’s disks are misaligned and torn publishing their findings in Science in September 2020.

Is the biggest star 700 times bigger than the sun?

Betelgeuse is the brightest star in Orion and marks the western shoulder of the constellation. Betelgeuse is one of the largest known stars and is probably at least the size of the orbits of Mars or Jupiter around the sun. That’s a diameter about 700 times the size of the Sun or 600 million miles.

What caused the black lines in absorption spectra quizlet?

Absorption lines are produced when a certain element or molecule is hit with a light absorbs that light yielding an absorption spectra with black lines indicating where no light gets through to the element. When the electron jumps up it must absorb that same frequency photon in order to do so.

What causes the black lines that are seen in the absorption spectra of gases like hydrogen and helium?

Electrons emit radiation continuously while orbiting the nucleus. What causes the dark lines in the absorption spectrum of an element to occur? Photons are absorbed when electrons jump from a lower-energy to a higher-energy state. … All noble gases have the same spectra.

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What causes the dark lines in the absorption spectrum of an element to occur?

An absorption spectrum occurs when light passes through a cold dilute gas and atoms in the gas absorb at characteristic frequencies since the re-emitted light is unlikely to be emitted in the same direction as the absorbed photon this gives rise to dark lines (absence of light) in the spectrum.

What causes lines in a line spectrum?

The presence of spectral lines is explained by quantum mechanics in terms of the energy levels of atoms ions and molecules. … This causes an electron to be promoted into a higher energy level and the atom element or molecule is said to be in an excited state.

What causes specific lines to appear in a line spectrum?

Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion) energy in the form of light (or other radiation) is emitted or absorbed.…

Which planet has only one moon?


Read More
Planet / Dwarf Planet Confirmed Moons Provisional Moons
Earth 1
Mars 2

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How is Uranus blue?

The blue-green color results from the absorption of red light by methane gas in Uranus’ deep cold and remarkably clear atmosphere. … In fact the limb is dark and uniform in color around the planet.

Do all planets rotate?

The planets all revolve around the sun in the same direction and in virtually the same plane. In addition they all rotate in the same general direction with the exceptions of Venus and Uranus. These differences are believed to stem from collisions that occurred late in the planets’ formation.

Which layer of the Sun emits its blackbody spectrum?

the photosphere
Since the photosphere is cooler but less dense than the interior region it is the screen that allows the continuous blackbody spectrum to be seen through.

What information about an astronomical object can be determined by observing its spectrum?

From spectral lines astronomers can determine not only the element but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.

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How do scientists apply the emission spectra to investigate the chemical composition of stars?

Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object’s spectrum they can determine its composition based on these wavelengths. … Today this process uses instruments with a grating that spreads out the light from an object by wavelength.

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How long is 1 second in space?

It is defined as the distance that light travels in free space in one second and is equal to exactly 299 792 458 metres (983 571 056 ft).

Use in astronomy.
Unit light-hour
Definition 60 light-minutes = 3600 light-seconds
Equivalent distance in m 1079252848800 m
km 1.079×109 km

How long is 1 hour in space?

Answer: That number times 1 hour is 0.0026 seconds. So a person at that deep space location would have a clock that would run for one hour while that person calculated that our clock ran for 59 minutes 59.9974 seconds.

Is there oxygen in Mars planet?


What causes the up and down motion of the Sun?

Because the Earth speeds up and slows down as it orbits the Sun. Most of the Sun’s apparent motion comes from the Earth’s rotation. As our planet spins the Sun the Moon and all the stars appear to move from east to west just like if you spin around in an office chair and the walls all appear to move the other way.

What do we call the apparent motion of an object with observed from two different perspective?

Parallax the apparent motion of objects due to the changing angle of observation of an observer on Earth revolving around the Sun.

What is the moon movement?

The Motion of the Moon. The Moon moves around the Earth in an approximately circular orbit going once around us in approximately 27.3 days or one sidereal period of revolution. … Moving once around in 27.3 days its average movement is about 13.2 degrees per day or 92 degrees per week.

What causes the apparent movement of the Sun across the sky during the day on?

This apparent motion across the sky is due to the rotation of Earth. As Earth turns eastward on its axis we move along with it creating the illusion that the Sun moves through the sky over a day. … At this time the Sun appears to move in a high arc across the sky.

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