Tag: evolution and end stages of stars

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Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

Which of the following lists contains ONLY heavy elements

  1. Oxygen, Carbon, Iron

  2. Helium, Oxygen, Carbon

  3. Hydrogen, Helium, Carbon

  4. Iron, Hydrogen, Oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Helium and hydrogen being lighter gases are seen in other options other than option a. Thus , such options are incorrect options

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

In which of the following stages will our Sun form heavy elements?

  1. Red giant

  2. Stellar Nebula

  3. Blackhole

  4. Main sequence
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 In approximately 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. In a red giant, helium nuclei fuse to make carbon, followed by heavier elements such as nitrogen and oxygen.

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

After a supernova explosion, the remains of the stellar core 

  1. will always be a neutron star.

  2. will be either a neutron star or a black hole.

  3. will always be a black hole.

  4. may be either a white dwarf, neutron star, or black hole
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Depending on the mass of the remaining core after a supernova, it will collapse into either a neutron star (if the mass is below the Tolman-Oppenheimer-Volkoff limit) or a black hole (if it exceeds that limit).

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

Analyzing the spectra of stars, the hottest stars are

  1. red

  2. orange

  3. bluish white

  4. there is no correlation between color and temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The temperature of the stars are related to their colors by weins displacement law. Larger the temperature, smaller is their wavelength. Thus, of the colors given , red has maximum wavelength and hence smaller temperature, while bluish white has lesser wavelength and highest temperature. Thus, the star that emits bluish-white color has maximum temperature

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

White dwarfs

  1. are believed to be very small, perhaps about the size of the earth.

  2. contain atoms that have collapsed in the center, yet retain the standard distances between nuclei and electrons.

  3. are totally hypothetical stars, based on the best theories, but have never been observed directly.

  4. are found only on the far edge of the universe.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

White dwarf stars are characterized by a low luminosity, a mass on the order of that of the Sun, and a radius comparable to that of Earth.

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

Most stars give off energy

  1. By nuclear fission or elements heavier than carbon.

  2. By the proton cycle or the carbon cycle.

  3. Drawing it from the virtual vacuum through a black hole.

  4. By burning hydrogen and giving off water vapor.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The protonproton chain reaction is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium. Using this method, the stars convert particles to energy

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

As the age of star increases

  1. Helium quantity increases

  2. Helium quantity decreases

  3. Helium quantity does not

    change

  4. Helium, Hydrogen both

    quantities increases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As a star ages, it fuses hydrogen into helium in its core. Therefore, the proportion of helium increases over time as the hydrogen fuel is consumed.

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

What can we learn about a star from a life track on an H-R diagram?

  1. how long ago it was born

  2. when it will die

  3. where it is located

  4. what surface temperature and luminosity it will have at each stage of its life
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The HertzsprungRussell diagram, abbreviated HR diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures. More simply, it plots each star on a graph measuring the star's brightness against its temperature (color).

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

______________are the result of exploding stars that initially are more than about eight times the sun's mass.

  1. stars

  2. black hole

  3. supernova

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A supernova is the violent explosion of a massive star, typically one that is at least eight times the mass of the Sun, occurring at the end of its life cycle.

Multiple choice physics life cycle of stars evolution and end stages of stars the stars stars

Which of the following is the stage where a massive star explodes and releases a lot of energy?

  1. Red supergiant

  2. Blackhole

  3. Main sequence

  4. Supernova
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stars with very large masses can become black holes. A black hole releases a huge amount of gravitational energy, as material swirls toward its event horizon. This energy produces a jet of particles that streams over a distance of 300,000 light-years.