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3 years ago

Although it has a greater ____ than Sirius, Rigel does NOT look as bright in the night sky.

2 answers:

8 0

Option (d) is correct. The absolute magnitude of the Rigel is more than that of Sirius but it does not appear more bright in night sky.

Explanation:

The absolute magnitude of a star is defined as the magnitude of the brightness of the star. It depends on the total amount of the light emitted by the particular star.

The brightness of the star is measured in terms of two quantities. The absolute magnitude and the apparent magnitude of the star. The apparent magnitude of the star is the brightness observer by the observer which is present at a particular distance from the observer.

The distance of the star Sirius from the surface of the Earth is about $8\text{ light years}$ whereas the distance of the star Rigel from the surface of the Earth is about $850\text{ light years}$ .

The huge distance of the Rigel from the Earth makes it less brighter than the Sirius in the night sky in spite of having greater absolute magnitude. It is because the apparent magnitude of the star as observed on the Earth is greater for the star Sirius due to its smaller distance as compared to the Rigel.

Thus, Option (d) is correct. The absolute magnitude of the Rigel is more than that of Sirius but it does not appear more bright in night sky.

Learn More:

1. How does reflection differ from refraction and diffraction brainly.com/question/3183125

2. When does an equinox occur brainly.com/question/1000562

3. Derive the formula for mass of the planet brainly.com/question/2289465

Answer Details:

Grade: High School

Subject: Physics

Chapter: Astronomy

Keywords:

apparent, absolute, magnitude, star, observer, brightness, Sirius, Rigel, parallax, bright, light year, distance.

Alecsey [184]3 years ago

7 0

Rigel has a much greater absolute magnitude than Sirius, but appears to be much dimmer. This is due to the fact that Rigel is about one hundred times further away than Sirius. Sirius is a much lower energy star, but appears to be the brightest star in the sky because of its relatively close proximity of 8 light years.

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An incident ray traveling in a slower medium strikes a boundary with a faster medium. What happens when its angle of incidence i

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The phenomenon that is observed when an incident ray travelling in a slower medium strikes the boundary of a faster medium with an angle greater than the critical angle is known as total internal reflection.
Total internal reflection results in the the ray being reflected within the medium, instead of leaving it after undergoing diffraction. This phenomenon is the working principle of optical fibers.

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4 years ago

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A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward a

Helga [31]

Answer:

d. may be either greater, smaller, or equal to that observed inside the bus.

Explanation:

The bus is moving at a constant speed. The ball tossed and received by the ball is inside the bus at a speed equal to the speed of the ball. Therefore the speed of the bus becomes zero with respect to the observer inside the bus.
Now the observer inside the bus noticed the ball from the inside of the bus, so he threw the ball back and forth from the ball with the speed v relative to the observer.
Now the observer outside the bus could see the bus moving at speed relative to its reference point and also throwing the ball from front to back. The speed of the ball to the observer outside the bus The speed of the bus to the observer outside the bus is minus the speed of the ball to the observer inside the bus.
Therefore, the ball speed = (u-v) relative to the observer outside the bus.

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3 years ago

true or false temperature and precipitation are the two most important elements of climate for the majorit of living things

kirza4 [7]

temperature and precipitation are the two most important elements of climate for the majorit of living things.
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3 years ago

If the frequency of the disorder in the population is 0.000081, what is the percentage of heterozygous carriers?

patriot [66]

The frequency of the disorder in the population is 0.000081, So, the percentage of heterozygous carriers would be 0.018.

Unlike homozygous, being heterozygous means you have two different alleles. You inherited a different version from each parent. In a heterozygous genotype, the dominant allele overrules the recessive one. Therefore, the dominant trait will be expressed. The recessive trait won't show, but you're still a carrier.

The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles.

The Hardy-Weinberg equation is given by :

⇒ p² + 2pq + q² = 1

Here, p and q represent the individual allele frequencies.

Therefore, p² = frequency of homozygous condition represented by p.

q² = frequency of homozygous alleles represented by q.

and 2pq = frequency of heterozygous condition.

So, the correct answer is '2pq'.

⇒ (aa) q² = 0.000081,

⇒ (a) q = 0.009,

⇒ (A) p = 0.991,

⇒ (Aa) 2pq,

⇒ 0.018.

To learn more about heterozygous carriers here

brainly.com/question/17458395

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2 years ago

An object starts from rest and has an acceleration given by a = 3.00 t^2 – 4.20 t. Determine how far the object is from its star

Korolek [52]

Answer:

38.7 units

Explanation:

a = 3.00 t² – 4.20 t

Integrate to find velocity as a function of time.

v = ∫ a dt

v = ∫ (3.00 t² – 4.20 t) dt

v = 1.00 t³ – 2.10 t² + C

The object starts at rest, so at t = 0, v = 0.

0 = 1.00 (0)³ – 2.10 (0)² + C

0 = C

v = 1.00 t³ – 2.10 t²

Integrate to get position as a function of time.

x = ∫ v dt

x = ∫ (1.00 t³ – 2.10 t²) dt

x = 0.250 t⁴ – 0.700 t³ + C

Find the difference in positions between t = 4.50 and t = 0.

Δx = [0.250 (4.50)⁴ – 0.700 (4.50)³ + C] – [0.250 (0)⁴ – 0.700 (0)³ + C]

Δx = 0.250 (4.50)⁴ – 0.700 (4.50)³

Δx = 38.7

The object moves 38.7 units.

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3 years ago