MISTAKES

describe what happens during beta decay

• gives out a high speed electron

• neutron turns into a proton

describe what happens to the nucleus during beta decay

• nucleus loses a neutron

• nucleus gains a proton

hazards involved with radioactive disposal (4)

• radiation causes cancer

• radiation is highly penetrating

• remain radioactive for some time

• contamination of waterways

precautions for radioactive waste disposal (4)

• lead shielding

• security - prevent public access

• protected against damage

• special facilities required

callisto has a g of 1.2n/kg, and the moon has a g of 1.6n/kg. callisto has a larger mass, why is its g lower? (3)

• larger radius

• lower density

• smaller core

how could the student determine the extension of the rubber band? (3)

• measure unstretched length

• with a ruler

• extension = stretched length - original length

why does the air move up through the external pipe? (3)

• air inside pipe is heated

• air expands and particles move further apart

• air decreases in density so rises

explain how air is cooled as it travels through the tube (3)

• air entering tube is hotter than the ground

• energy is transferred from air to surroundings

• by conduction