The binding energy of helium -4 is 28 mev. a. what is the mass of a helium nucleus (round to 5 decimal places)?

4.001805 amu

Explanation:

931 Mev = 1 amu

28 Mev = 28 / 931 Mev

= .030075 amu

Helium nucleus consists of 2 proton and 2 neutron .

Binding energy in terms of amu

= total mass of 2 neutron and 2 proton - mass of nucleus of helium

mass of nucleus of helium = total mass of 2 neutron and 2 proton -Binding energy in terms of amu

mass of 2 neutron = 2 x 1.008664 = 2.017328

mass of 2 proton = 2 x 1.007276 = 2.014552

total = 4.03188

So mass of helium nucleus = 4.03188 - .030075

= 4.001805 amu.

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation:

thermal energy is the answer