KPK Board 10th Class Physics Ch 9 Nuclear physics Short Questions Answers

KPK Board 10th Class Physics Ch 9 Nuclear physics Short Questions Answers

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After Online tests for all subjects now it’s time to prepare the next level for KPK board students to prepare their short question section here. We have a complete collection of all classes subject wise and chapter wise thousands questions with the right answer for easy understanding.

We provided 10th class Physics short questions answers on this page of all KPK boards. Students of KPK boards can prepare the Physics subject for annual examinations.

In this List we have included all KPK boards and both Arts and Science students. These Boards students can prepare their exam easily with these short question answer section

Malakand Board 10th classes short questions Answer

Mardan Board 10th classes short questions Answer

Peshawar Board 10th classes short questions Answer

Swat Board 10th classes short questions Answer

Dera Ismail Khan Board 10th classes short questions Answer

Kohat Board 10th classes short questions Answer

Abbottabad  Board 10th classes short questions Answer

Bannu Board 10th classes short questions Answer

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The atomic number of one particular isotope is equal to its mass number. Which isotope is it?

Ans.    Protium  (a stable isotope of hydrogen) has same atomic number and mass number, equal to 1.

Explanation:          Hydrogen is the 1st element in periodic table having three isotopes, protium   deuterium  and Tritium. Protium has one proton inside the nucleus and no neutron. Therefore, its atomic number as well as mass number is equal to one.

Which is more likely to expose film kept in a cardboard box, α- particles or β- particles? Explain.

β- particle is more likely to expose a film kept in a cardboard box as α- particle can easily be blocked by a paper and cannot penetrate cardboard.

Explanation:           Penetration power of  β- particles is greater than that of α- particles that is why β- particles can easily penetrate through a cardboard. A film kept inside the cardboard will be affected by the  β- particles easily.

Is it possible for a form of heavy hydrogen to decay by emitting an alpha particle? Explain.

Ans.         No, it is not possible for any form of hydrogen to decay by emitting an alpha particle.

Explanation:             Hydrogen is the 1st element in periodic table having three isotopes, Protium 1H( having only one proton ionside nucleus), deuterium 2H (having one proton and one neutron inside nucleus) and Tritium 3H (having on proton and two neutrons inside nucleus). Whereas, an alpha particle is composed of two protons and two neutrons. That is why it is not  possible for any isotope (form) of Hydrogen to decay by emitting an alpha particle.

Different isotopes of a given element have different masses, but they have the same chemical properties. Explain why chemical properties are unaffected by a change of isotope?

Ans.        They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element.

Explanation:             The element arrangement is the same owing to same chemical properties. However, they have different number determines the physical properties such boiling / melting / density etc.

What fraction of a radioactive sample has decayed after two half-lives have elapsed?

After two half-lives,3⁄4 of a radioactive sample has been decayed.

Explanation: After 1st half-life, half of the sample will be decayed whereas, half will be left. After 2nd half-life, another half of the half (i.e. 1⁄2of 1⁄2) will be decayed( i.e. 1⁄4 will be decayed in 2nd half-life and 1⁄4will be left in total).

Can carbon-14 dating give the age of fossil dinosaur skeletons? Explain.

Ans.    All biologic organisms contain a given concentration of carbon-14; we can use this information to help solve questions about when the organism died. When an organism dies it has a specific ratio by mass of carbon-14 to carbon -12 incorporated in the cells of its body.  (The same ratio as in the atmosphere.) At the moment of death, no new carbon-14 containing molecules are metabolized; therefore, the ratio is at a maximum.  After death, the carbon-14 to carbon-12 ratio begins to decrease because carbon-14 is decaying away at a constant and predicable rate. Remembering that the half-life of carbon-14 is 5700 years, then after 5700 years half as much carbon-14 remains within the organism.

Some food is treated with gamma radiation to kill bacteria. Why is there Not a concern that people who eat such food might be consuming gamma radiations?

Ans.   There is a common misconception that irradiated food is radioactive.  The radiation used to process foods is very different from the radioactive fallout that occurs after, for example, a nuclear accident. In food processing, the radioactive sources permitted do not generate gamma, electrons or x-rays of sufficient high energy to make food radioactive. No radioactive energy remains in the food after treatment.  The World Health Organization (WHO), the American Dietetic association and the Scientific Committee of the European Union are three internationally recognized bodies that support food irradiation.

Radioactive ………. emitters are relatively harmless outside the body, but can be dangerous if ingested or inhaled?

Ans.      Alpha particles are the least dangerous in terms of external exposure. Each particle contains a pair of neutrons and a pair of protons. They don’t penetrate very deeply in the skin, if at all – in fact, clothing can stop alpha particles. Unfortunately, alpha particles can be inhaled or ingested, usually in  the form of radon gas.  Once ingested, alpha particles can be very dangerous.  However, even then they don’t typically cause radiation sickness—instead, they lead to lung cancer.

If nuclear radiation is harmful, how it can be used for treatment of diseases?

Ans.         Nuclear medicine pharmaceuticals give off gamma rays and particles that allow us to track the radioactive pharmaceuticals within body. The scanners themselves do not create radiation .Very small amounts are used for imaging scans. The radiation disappears (decays) in a very short time due to which it is not harmful for humans. Larger amount are used for therapy but in that case the radiation is targeted very precisely at the cancer cells in order to kill them. For effective doses from nuclear medicine procedures, only one-twentieth of a percent (0.05%) of the patients who have a test may develop a fatal cancer sometime later in life.   

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