OB. The water is pushing the boat 20 m/s upstream.
C. The water is pushing the boat 6 m/s against the wind.
OD. The water is pushing the boat 10 m/s downstream
29.5 Earth days in duration
places a sheet of paper between the source and the detector and records the count rate,
and then repeats this with a sheet of aluminium instead of paper. Describe how her
results will allow her to work out which type of radiation is emitted by the source.
Please help :)
Answer:
Beta radiation
Explanation:
Radiation differs in its ability to penetrate a material (or air) - alpha particle has the least penetrating power and thus is stopped by the paper. Both beta and gamma particles have higher penetrating power than alpha - they passed through. However, radiation was stopped by a sheet of aluminium, which indicates a beta particles, since gamma radiation particles (photons) can easily pass through aluminium and some solid lead block is required to stop it.
When swimming, you are at rest relative to the water and moving relative to the sides of the pool.
When riding a bike, you are at rest relative to the bicycle and moving relative to the road