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Anna71 [15]
3 years ago
9

Every star is part of a constellation and is assigned a Greek letter within the constellation. Many stars still bear ancient Ara

bic names. Based on what you learned about how astronomers refer to stars, select all of the correct statements from the following list.
All 88 constellations are based on figures that originated in Greek and Middle Eastern mythology.
The α star in a constellation is usually brighter than the β star.
Only the α star of each constellation has an ancient Arabic name.
If a star has an ancient Arabic name, it must be an α star.
All stars are part of some constellation.
A star with an ancient Arabic name is probably relatively bright.
The modern constellations have English names rather than Latin like the ancient ones.
Physics
1 answer:
Andru [333]3 years ago
8 0

Answer:

All 88 constellations are based on figures that originated in Greek and Middle Eastern mythology. (<em>Correct</em>)

The α star in a constellation is usually brighter than the β star. (<em>Correct</em>)

All stars are part of some constellation. (<em>Correct</em>)

The modern constellations have English names rather than Latin like the ancient ones. (<em>Correct</em>)

Explanation:

Constellations were grouped by different civilizations as mean to be oriented when they were making observations of the sky (they could see as maps of certain regions). Each constellation is an arrangement of several stars in a specific figure (animals, mythological characters and objects), things that were important for that civilization.

The letter \alpha is given to the brightest star in a constellation while the other letters of the Greek alphabet are assigned to the other stars that belong to that specific constellation according to their brightness. For example in the Orion constellation the brightest star is Betelgeuse so it is classified with an \alpha; \beta to Rigel, the second in brightness and so on. That classification system was established by the astronomer Johann Bayer in 1603.

The modern constellations have English names, for example the constellations of Telescopium, Fornax, Sculptor, Chamaeleon, among others.

As constellations represent maps of different regions in the sky, any star will be related with them. For that reason is correct to say that all stars are part of some constellation.

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A wave travels at 295 m/s and has a wavelength of 2.50 m. What is the frequency of the wave?
posledela

Answer:

118\; \rm Hz.

Explanation:

The frequency f of a wave is equal to the number of wave cycles that go through a point on its path in unit time (where "unit time" is typically equal to one second.)

The wave in this question travels at a speed of v= 295\; \rm m\cdot s^{-1}. In other words, the wave would have traveled 295\; \rm m in each second. Consider a point on the path of this wave. If a peak was initially at that point, in one second that peak would be

How many wave cycles can fit into that 295\; \rm m? The wavelength of this wave\lambda = 2.50\; \rm m gives the length of one wave cycle. Therefore:

\displaystyle \frac{295\;\rm m}{2.50\; \rm m} = 118.

That is: there are 118 wave cycles in 295\; \rm m of this wave.

On the other hand, Because that 295\; \rm m of this wave goes through that point in each second, that 118 wave cycles will go through that point in the same amount of time. Hence, the frequency of this wave would be

Because one wave cycle per second is equivalent to one Hertz, the frequency of this wave can be written as:

f = 118\; \rm s^{-1} = 118\; \rm Hz.

The calculations above can be expressed with the formula:

\displaystyle f = \frac{v}{\lambda},

where

  • v represents the speed of this wave, and
  • \lambda represents the wavelength of this wave.

6 0
3 years ago
At which type of boundary between two tectonic plates is an earthquake or a tsunami most likely to form?
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B. convergent boundary

Explanation:

Convergent boundaries, where ocean plates are subducted at trenches, produce the most tsunamis because they produce the largest earthquakes

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Ancient Greek philosophers were the first to discuss atoms and matter. This became known in time as____________. Atomic theory s
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Answer:

atoms,

Explanation:

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swat32

Answer:

10 days

Explanation:

The half-life of a radioactive sample is the time taken for half of the sample to decay.

In the diagram, the half-life corresponds to the time after which the % of cobalt-57 has halved. We can observe the following:

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This means that the sample of cobalt-57 has halved in 10 days, so the half-life of cobalt-57 is 10 days.

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