GCSE Physics (pp1)Question and answers.

GCSE Physics (pp1)Question and answers. Alpha, beta and gamma radiation is ionising. What does it mean? -Answer-Knocks electrons off atoms creating positive ions. At a constant temperature, the current through an ohmic conductor is... -Answer-Directly proportional to the potential difference across the resistor. Bio-fuels made from plants are said to be carbon neutral why? -Answer-CO2 released when the fuel burns is removed from the atmosphere when the plants grow Describe the current flow through a diode. -Answer-It can only flow in one direction. There is a very high resistance in the reverse direction. Describe the experiment Rutherford and Marsden did -Answer-Fired alpha particles at a thin piece of gold foil. Describe the flow of current in an AC circuit -Answer-The current flow rapidly changes direction, giving an alternating potential difference. Draw a series circuit containing a cell and a bulb. -Answer-Image result for cell bulb circuit For some resistors, the resistance always remains constant. In others, it can change as... -Answer-The current changes. Fossil fuels are non-renewable, what does it mean? -Answer-They will run out Gamma radiation does not have a nuclear equation, why? -Answer-No particle is lost from the nucleus, just energy Give an example of a radioactive tracer and its use. -Answer-Iodine-123, used to find out if the thyroid gland is absorbing iodine normally Give an example of how energy is transferred electrically? -Answer-A complete circuit allowing charge to flow