Nervous System The nervous system is the part of an animal’s body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. In most types of animals it consists of two main parts‚ the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves‚ which are long fibers that connect the CNS to every other part of the body. The PNS includes motor
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The half life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later? Answer 0.166 0.125 0.062 here 0.015 Which relation is not correct? Answer 11p = 11H = proton 0-1e = 0-1β = electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number higher than the original element
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was chosen is because his work had information on protons‚ neutrons‚ and electrons‚ the main components that make up the atom‚ showed what the atom looks like when the three are put together‚ and had also been the discoverer of the nucleus which is the one of them most important parts of the atom’s structure. The discovery of the particles that
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where nuclear forces come into play. It is the “Hydrogen Atom” of nuclear physics. It may also be viewed as the simplest odd-odd nucleus‚ having one proton and one neutron. It exhibits features which require the use of a number of new concepts such as exchange force‚ tensor force etc. Of three possible states of two nucleon system‚ di-neutron‚ di-proton‚ and deuteron only deuteron is known to be stable. Since there are only two particles in the nucleus‚ the deuteron problem can be reduced to a one
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electricity is a form of energy resulting from the existence of charged particles (such as electrons or protons)‚ either statically as an accumulation of charge or dynamically as a current. Thus‚ to describe electricity we must introduce the idea of positive and negative electrical charge‚ which is stored energy associated with particles – electrons and protons. It is tempting to think of electrons and protons as discrete‚ hard objects‚ like marbles. However‚ the physical reality is much more complicated
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contributed most to our knowledge of the structure of the atom was by Ernest Rutherford. There are more atomists such as J.J. Thomson‚ Niels Bohr‚ James Chadwick‚ Marie Curie and Henry Moseley. An atom contains three subatomic particles‚ which are protons and neutrons that are found at the center of the nucleus and around the nucleus there are electrons. There are many atomic models corresponding with the theories. Democritus "Nothing exists except atoms and empty space; everything else
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Prelab Questions 1. Neutrons were discovered in 1932‚ more than 10 years after the existence of isotopes was confirmed. What property of electrons and protons led to their discovery? Suggest a possible reason why neutrons were the last of the three classic subatomic particles to be discovered. The property that led to the discovery of electrons and protons was their charges. Neutrons were the last of the three subatomic particles to be discovered because they have no charge and therefore it was harder
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Democritus 1 Democritus Democritus was a Greek Philosopher born 460 B.C. in the city of Abdera‚ and died 370 B.C. He was born into a wealthy family and traveled the world extensively. He was known as the “laughing” philosopher‚ or the “happy” philosopher because he would constantly mock people‚ and laugh incessantly about his own jibes. Throughout his life he wrote over 70 books‚ however very few pages have survived the years. Some have said that Democritus blinded himself to better understand
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The History of the Atom Hypothesis according to Aristotle (350 BC): All matter consists of the elements earth‚ air‚ fire‚ and water. Experiment: A tree grows from the earth as water is added. The tree is then set on fire in an effort to form new elements. 1. What kind of results would be observed from this experiment? Fire‚ ash (earth)‚ smoke (air) 2. Would these observations support or reject the hypothesis? Explain. Support. No elements have been produced that are something other than
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Pudding- electrons float around in a positive charged “pudding” b. Nuclear Model- atom is mostly empty space. All the positive charge and almost all the mass is concentrated in a small area in the center‚ called the nucleus. Nucleus is composed of protons and neutrons c. Planetary- electrons orbit the nucleus like planets d. Quantum-atom is found inside a blurry electron cloud 11. Scientists – Thomson‚ Rutherford‚ Millikan‚ etc. Democritus- He believed that atoms were
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