1. Best Answer

    The scientists' name have been correctly matched with their contributions/discoveries below: (i) Faraday → (g) Law of electromagnetic induction (ii) Rutherford → (j) Nuclear model of atom (iii) Chadwick → (i) Neutron (iv) Bohr → (b) Quantum model of hydrogen atom (v) Newton → (a) Law of gravitation,Read more

    The scientists’ name have been correctly matched with their contributions/discoveries below:

    (i) Faraday → (g) Law of electromagnetic induction
    (ii) Rutherford → (j) Nuclear model of atom
    (iii) Chadwick → (i) Neutron
    (iv) Bohr → (b) Quantum model of hydrogen atom
    (v) Newton → (a) Law of gravitation, Laws of motion
    (vi) Maxwell → (c) Unification of light and electromagnetism
    (vii) Salam → (f) Unification of weak and electromagnetic interactions
    (viii) Einstein → (h) Theory of relativity, Explanation of photoelectric effect
    (ix) Roentgen → (e) X-rays
    (x) Madam Curie → (n) Discovery of radium
    (xi) J. J. Thomson → (m) Electron
    (xii) de Broglie → (k) Wave nature of matter
    (xiii) John Bardeen → (l) Transistor
    (xiv) Hubble → (h) Expansion of the universe

    (i ) – (g); (ii) – (j); (iii) – (i); (iv) – (b); (v) – (a); (vi) – (c); (vii) – (f); (viii) – (d); (ix) – (e); (x) – (n); (xi) – (m); (xii) – (k); (xiii) – (l); (xiv) – (h).

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  2. Best Answer

    In any nuclear reaction, the number of nucleons remains unchanged. The radioactive decay of uranium nucleus is: 92U238 → 90Th234 + 2He4 The total number of nucleons is 238 before as well as after the decay.

    In any nuclear reaction, the number of nucleons remains unchanged. The radioactive decay of uranium nucleus is:

    92U23890Th234 + 2He4

    The total number of nucleons is 238 before as well as after the decay.

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  4. Two advancements made in technology on the basis of physics, are: 1. The discovery of nuclear fission has provided a tremendous source of energy. In nuclear reactors and nuclear bombs a large amount of energy is released by conversion of mass into energy. 2. The phenomenon of population inversion haRead more

    Two advancements made in technology on the basis of physics, are:
    1. The discovery of nuclear fission has provided a tremendous source of energy. In nuclear reactors and nuclear bombs a large amount of energy is released by conversion of mass into energy.
    2. The phenomenon of population inversion has given rise to lasers which cover an extremely wide field of practical applications.

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  5. Scientists have always remained in quest that there must be a single force, of which the four fundamental forces should be the different manifestations. Efforts are being carried out to develop a theory (called united field theory) that may link the properties of the fundamental forces. The idea ofRead more

    Scientists have always remained in quest that there must be a single force, of which the four fundamental forces should be the different manifestations. Efforts are being carried out to develop a theory (called united field theory) that may link the properties of the fundamental forces.
    The idea of unification is the result of applicability of various laws in different fields. For example, the gravitational force (given by Newton’s gravitational law) on one side is responsible for the fall of apple from tree to the ground while on the other side is responsible for the motion of planets around the sun and also motion of satellites. Similarly electric and magnetic phenomena have been proved inseparable (by Oersted and Faraday experiments), the sound and light waves indicate some similar phenomena, etc.

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  7. The development in Physics are having a direct impact on society. A number of examples can be given: 1. Telephone, telegraph, telex, teleprinter and now fax are extensively used by housewives, businessmen, industrialists and professionals. 2. Radio, television and satellites, as means of communicatiRead more

    The development in Physics are having a direct impact on society. A number of examples can be given:
    1. Telephone, telegraph, telex, teleprinter and now fax are extensively used by housewives, businessmen, industrialists and professionals.
    2. Radio, television and satellites, as means of communication, have connected all parts of the world together.
    3. Calculators, computers and lasers have changed the day-to-day life of the mankind.
    4. Exploration of the new sources of energy has become absolutely necessary for the existence of future generations.
    5. The development of nuclear power has become a threat to the existence of life on the earth.

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  8. Best Answer

    In CuSO4.5H2O, we have: 1 Copper (Cu) atom, 1 Sulphur (S) atom, 4 Oxygen (O) atoms, 5*2 = 10 Hydrogen (H) atoms, and 5*1 = 5 Oxygen (O) atoms. Thus, in total, the number of atoms present in the compound is: 1+1+4+10+5 = 21.

    In CuSO4.5H2O, we have:
    1 Copper (Cu) atom,
    1 Sulphur (S) atom,
    4 Oxygen (O) atoms,
    5*2 = 10 Hydrogen (H) atoms,
    and 5*1 = 5 Oxygen (O) atoms.

    Thus, in total, the number of atoms present in the compound is: 1+1+4+10+5 = 21.

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