The work function (energy needed to remove an electron) of gold is 5.1 ev. two pieces of gold (at the same potential) are separated by a distance l. for what value of l will the transmission probability for an electron to cross from one to the other be t ≈ 10-3? assume that g = 1 in the formula for the tunneling probability.

The value of L is 0.3 nm.

Explanation:

Given that,

Energy

Transmission probability = 10⁻³

We need to calculate the value of L

We know that,

Formula of tunneling probability

....(I)

Where,

....(II)

Where, m = mass of electron

Put the value in equation (II)

From equation (I)

Hence, The value of L is 0.3 nm.

explanation:

specific heat is the amount of heat required to raise the temperature of a unit mass of a substance.

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.