Why didn’t atoms exist until hundreds of thousands of years after the Big Bang?

Q: How many half-lives have passed if about 3% (rounded) of the original parent material is left?

A: How many half-lives have passed if about 3% (rounded) of the original parent material is left?

Q: Different nuclides of the same element have the same number of protons and the same number of…

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Q: Does the uncertainty principle tell us that we can never know anything for certain?

A: Heisenberg's uncertainity principle states that product of uncertainity in position and momentum is…

Q: The radar active element carbon 14 has a 1/2 life of 5750 years as scientists determined that the…

A: Given , half life of carbon , t1/2 = 5750 years Lost carbon 14 is 5.19 % Let N0 is the initial…

Q: Why doesn’t the repulsive electric force of protons in the atomic nucleus cause the protons to fly…

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Q: 1. 8900000000 2. 1768900000000 3. 609800000000000 4. 0.00000000001234 5. 0.00000009034

A: The standard form any number means the number in decimal form with the multiplication of the power…

Q: How many shells are represented in the presently known periodic table?

A: In the current periodic table elements may have up to seven shells, and in each shell, there are…

Q: How were X-rays first discovered?

A: X- rays were first discovered by Wilhelm Rontgen in 1895 by accident. He was working with cathode…

Q: What is Particle physics?

A: Particle Physics is the branch of science that deals with the nature of the particles that…

Q: Where were the atoms that make up a newborn infant “manufactured”?

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Q: The atomic nucleus is most often made up of

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Q: We need to estimate the temperature at recombination from the figure below. (Estimate a temperature…

A: From the graph, the temperature at the recombination i;

Q: Why do the charged particles flying through bubble chambers travel in spiral paths rather than in…

A: Charged particles flying through bubble chambers travel in spiral paths rather than in the circular…

Q: Why the cathode ray tube (CRT) is named so?

A: A cathode-ray tube (CRT) is a vacuum tube in which an electron beam, deflected by applied electric…

Q: Half Fraction life Remaining Remaining % 1 100% 1 1/2 50% 25% 1/8 4 1/16 6.25% 5 2. 3.

A: Half life is the time required for a quantity reduced to half of its initial value. Fraction…

Q: The starship Enterprise, of television and movie fame, is powered by combining matter and…

A: Understand that when matter and antimatter combines with each other, their mass also combines and…

Q: The weak and strong nuclear forces are basic to the structure of matter. Why we do not experience…

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Q: What occurs when a particle of matter and a particle of antimatter meet?

A: When a particle of matter and a particle of antimatter meet they annihilate each other and neither…

Q: Ten grams of carbon from a freshly felled tree produce 150 electrons (from β-decay) per minute. Ten…

A: Given, decay rate=25% t1/2=5730 yrs

Q: What fraction of the 40K that was on Earth when it formed 4.5×109 years ago is left today?

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Q: What do you mean by Hadrons?

A: In the study of atom, Hadrons are the subatomic particles which are made up of quarks, gluons and…

Q: composite particles or matter?

A: The Elementary  and composite particles are held together by a very strong nuclear force called…

Q: Define half-life.

A: The term half-life is used in the context of radioactivity. Some material is not stable, they are…

Q: How is collision between two billiards balls different from a collision between an alpha-particle…

A: There are three different kinds of collisions. Elastic Inelastic Completely inelastic.

Q: 2 ra 3 2 Is

A: Applying KVL to the upper loop,

Q: Where is the 1/4 comes from?

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Q: In the 19th century, the famous physicist Lord Kelvin estimated the age of Earth to be much less…

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Q: How is it possible for an element to decay “forward in the periodic table”—that is, to decay to an…

A: It is possible for an element to decay “forward in the periodic table”—that is, to decay to an…

Q: Trace amounts of 7Li were created during Big Bang Nucleosynthesis.  Calculate the binding energy per…

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Q: The Big Bang theory  states that the beginningof the universe was accompanied by a huge burst…

A: The temperature of the universe radiates like a blackbody is,

Q: Explain Big Bang in Nucleosynthesis

A: Big bang nucleosynthesis confirms the big bang hypothesis by explaining the high levels of helium…

Q: What exactly does the word "binding energy" imply?

A: Given : what exactly does the word " binding energy" imply?

Q: 08: why short lived ?-particle is more energetic

A: According to uncertainity principleΔE.ΔT=h2πΔE=change in energyΔT=  time intervalh=planck's…

Q: Are most of the atoms around us younger or older than the Sun?

A: Step 1 Sun is a star at the center of our universe. It is a sphere of hot plasma. Right now it is on…

Q: Erample 2 How much energy will be released by completely annihilating 1 mg of uranium atom?

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.