A multiflash photograph of a ball is being shot straight up by a spring. The spring, with the ball atop, was initially compressed to the point marked Yᵦₒₜ and released. The point marked Yᵦₒₜ is the point where the ball would remain at rest if it were placed gently on the spring, and the ball reaches its highest point at the point marked Yₜₒₚ.For most situations, the point Y₀ may be taken to be at the top of the spring, where the ball loses contact with the spring. Indicate whether the following statements are true or false. Assume that air resistance is negligible.1. The speed of the ball was greatest at point Y₀ when it was still in contact with the spring.2. The speed of the ball was decreasing on its way from point Y₀ to point Yₜₒₚ.3. The speed of the ball was zero at point Yₜₒₚ.4. The speed of the ball was the same for all points in its motion between points Y₀ and Yₜₒₚ.

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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.

close lines strong magnet less close weaker

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).