B: electron
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In one radioactive decay, radium (Ra) gives rise to radon (Rn) as shown. ²²⁶Ra → ²²²Rn ⁸⁸ ⁸⁶ What particle is also pr…
Which row is correct for fission and for fusion?
When a sample of a radioactive nuclide decays, the count rate falls from 1200 to 150 in three minutes. What is the ha…
A cyclist travels along a horizontal track at constant speed. The work done by the cyclist is equal to
A 2.0 kg mass has 300 J of kinetic energy. What is the speed of the mass?
The diagram shows a simple model of the braking system of a car. A force of 20 N is applied to piston P. As a result,…