Quiz Bank

  • difference between astronomical telescope and galilean telescope

    Comparison table :               Astronomical telescope     Galilean telescope 1:In an astronomical telescope the eyepiece is a convex lens. 1:In Galilean telescope the eyepiece is a concave lens. 2:It forms an inverted image.…

  • What is difference between Electrostatic force and nuclear force

    Electrostatic force Electrostatic force acts between charged particles only. Electrostatic force is a long range force. A proton can interact with all the protons within the nucleus through electrostatic force. Electrostatic force is a weak force. Nuclear force Nuclear force…

  • Why resistivity of semiconductors decreases with temperature?

    Solid materials having properties in between conductors and insulators are known as semiconductors. A semiconductor is a material that is neither a good conductor nor a good insulator of electricity. Its resistivity lies in between conductors and insulators, which is…

  • Why does n-type semiconductors have so many electrons than holes?

    The elements of group V are pentavalent such as arsenic (As), phosphorus (P), bismuth (Bi), and antimony (Sb). These have five electrons in their valence band. When one of these materials is added to a semiconductor like Si, four of…

  • Does a photon have a de Broglie wavelength?

    Yes a photon has de Broglie wavelength.In 1924,Louis de Broglie proposed that a particle must also act like wave,in silmilar way,wave behave like particles. In de Broglie hypothesis an electromagnetic wave is the de-Broglie wave for a photon moving with…

  • In our body,are there more neutrons than protons?

    Human body mainly contains water nearly 70 %.In all neutral atoms,the number of protons and electrons are equal.If you did have many more protons or electrons,yous body would become electrically charged,but normally ,the amount of protons and electrons are the…

  • Does the sun do any work on earth?

    No work is done on the earth revolving around it in a perfectly circular orbit. The earth revolves around the sun due to the gravitational force of attraction between the sun and the earth. This gravitational force provides centripetal force…

  • Why is the electron volt often a more convenient unit of energy than a joule?

    Both electron volt and joule are the units of energy. Since energies at the atomic level are very small and are expressed in electron volt rather than Joule because Joule is a bigger unit. Hence the unit electron volt for…

  • Why are some lines in the hydrogen spectrum brighter than others?

    In hydrogen spectrum,some spectral lines are brighter than others depending upon their energy level.These bright lines show that electrons have jumped from higher energy level to lower energy level.When electron jumps from some higher orbit,the energy released in the from…

  • Is an electron a particle or a wave?

    In 1924,de Broglie proposed that particle acts as a wave and wave acts as a particle. Davisson and Germer experimentally confirmed the wave nature of electron.They showed that electrons are diffracted from metallic crystal in the same manner as x-rays…

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