Definitely definite mass because liquids can take on any shape and can have different volumes.
I think I found it. It was a cylinder
Alpha particles, also called alpha ray or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a <u>helium-4 nucleus. </u>They are generally produced in the process of alpha decay, but may also be produced in other ways.
Composition: 2 protons, 2 neutrons
Mass: 6.644657230(82)×10−27 kg; 4.0015061...
Electric charge: +2 e
Symbol: α, α2+, He2+
A) Certain electrons in the dye molecule move to a higher energy level, with the difference in energy between the lower and higher energy levels being the same as the energy of the absorbed photons.
Explanation:
The reason behind the photonsWhen UV photon or a photon of visible light is absorbed by an atom then the summation whole of energy of that particular photon gets all excited to a higher energy level. The following movement of an electron to a higher energy level from a lower energy level is called as a transition. A successful transition occurs only in that condition when the energy of the photons which gets absorbed should be greater than or equal to the difference in energy between the underlying energy levels. also,we know that once the electron is being excited to a higher energy level, it becomes more unstable for a fact we know that electron becomes stable only when iot ios grounded or in groud state. As such, the electron will quickly fall back down to the lower energy level and hence it emits a photon with an energy equal to the difference in energy levels.
this explains best about the phenemenon of phtons of visible light being absorbed by dye molecules
