The energy of an ejected electron during the photoelectric effect depends on which of the following?
a the speed of the photon interacting with the electron
b the frequency of the light illuminating the metal
c the intensity of light illuminating the metal
d the charge of the electron

Explanation:

option A:

The photons are light particles.Their speed is always constant.So,their speed does not affect the energy of the ejected electron.

option B:

The energy of the photon is given by where is Plancks constant and is frequency.

The energy of the photon converts to the energy of the emitted electron.

So,when the frequency of the photon is higher,the energy of the emitted electron increases.

option C:

The intensity of light does not have any effect on energy of the electron emitted.The intensity only determines the number of photo electrons emitted.

option D:

The charge of the electron is a constant always.So,their charge does not affect the energy of the ejected electron.

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.

a. are