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Physics Test 13...

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  • Question 1
    4 / -1

    In a transistor

  • Question 2
    4 / -1

    A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be

  • Question 3
    4 / -1

    The mass number of a nucleus is

  • Question 4
    4 / -1

    Two protons are kept at a separation of 10 nm. Let Fn and  F e be the nuclear force and the electromagnetic force between them.

  • Question 5
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    Ten grams of 57Co kept in an open containg beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly

  • Question 6
    4 / -1

    A free neutron decays to a proton but a free proton does not decay to a neutron. This is because

  • Question 7
    4 / -1

    Magnetic field does not cause deflection in

  • Question 8
    4 / -1

    Beta rays emitted by a radioactive material are

  • Question 9
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    If elements with principle quantum number n>4 were not allowed in nature, the number of possible elements would be

  • Question 10
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    Consider the spectral line resulting from the transition n = 2  → n = 1 in the atoms and ions given below. The shortest wave length is produced by

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