Would a photon whose wavelength is 230 nm have enough energy to photodissociate o2 whose bond energy is 495 kj/mol? would it have enough energy to photoionize o2? match the words in the left column to the appropriate blanks in the sentences on the right.

Yes, a wavelength of 230 nm can photo ionize O2.

Explanation:

Wavelength, λ = 230 nm = 230 ×

Bond disassociation energy per mole = 495 kJ/mol

Bond disassociation energy per molecule =

= 8.22×

Wavelength associated with this bond energy is, =

=

= 242 nm

Therefore, any wavelength shorter than 242 nm can photo ionize O2.

which statement about this sum is true? −245+2.7

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.