One person weighs 70 kg and rides a lightweight bicycle on a flat road. the weight of the bicycle itself is neglected, and the ground friction on the bicycle is ignored. the bicycle has a wheel radius of 32 cm and the pedal has a radius of rotation of 16 cm. if the person continues to apply 20 n of force on the pedal (the direction of the force is perpendicular to the pedal radius), let the bicycle accelerate from the standstill. when the pedal turns 50 turns, what is the speed of the bicycle? (ignore air resistance during acceleration)

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

wavelength divides in half and speed stays the same.

cant without the picture! ?

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