What is occurring when a light wave diffracts?

question 5 options:

a. the light wave is bending around an obstacle or through a barrier.

b. the light wave is bouncing off of a smooth surface.

c. the light was is absorbing.

d. the light wave is bending when it goes from gas to liquid.

The light wave is bending around an obstacle or through a barrier shows diffraction.

Explanation :

Light is one of the forms of energy. It enables us to see objects clearly. It shows many phenomena like the reflection of light, refraction, interference, diffraction etc.

The light rays bend when it passes through a narrow opening or obstacles. The essential condition for the diffraction is that the size of an obstacle should be comparable to the wavelength of light.    

Hence, the correct option is (a) " The light wave is bending around an obstacle or through a barrier".

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.

no. dot product   =0 when vecs at right angles