12 Questions
What is the first step of the photochemical process in the formation of a latent image?
The production of the latent image
What is the purpose of the gelatin in the silver bromide emulsion?
To create electron traps within the silver bromide crystal
What is the purpose of the bromine ions in the silver bromide crystal structure?
To provide the negative charge for the ionic lattice
Which of the following processes is not involved in the mechanism of latent image formation?
Redox reaction
Where do the photon interactions typically occur during the exposure of the silver bromide crystal?
At the surface of the crystal
Which theory explains the growth process of the latent image?
Both Gurney Mott and Mitchell Theories
Which of the following statements is true about the interaction of photons with bromine ions in a crystal?
Interactions occur at the bromine ions because they are located on the surface of the crystal, releasing high energy electrons through photoelectric and Compton interactions.
According to the Gurney-Mott theory, what happens when an electron is captured by a trapping center?
A mobile positively charged silver ion migrates to this center and forms an unstable silver atom when combined with the electron.
According to the Mitchell theory, what is the sequence of events that leads to the formation of a stable-atom speck (latent sub-image center)?
A free electron and a silver ion approach a shallow electron trap together and immediately form a silver atom, which then acquires a second silver ion and a free electron to become stable.
What is the main difference between the Gurney-Mott theory and the Mitchell theory in terms of the formation of a stable-atom speck (latent sub-image center)?
In the Gurney-Mott theory, the stable-atom speck is formed directly, while in the Mitchell theory, it is formed through a series of steps involving a shallow electron trap.
What happens to the crystal lattice formation and the ions in the crystal after exposure, according to the text?
The crystal lattice formation is disrupted, and the ions in the crystal are now free to migrate and move around.
What is the growth process in the formation of a development center?
The growth process is the enlargement of sub-image centers until they become development centers, which require at least 10 silver atoms.
Test your knowledge on the latent image formation in photography and the chemistry of emulsion, including the process of forming silver bromide. Understand the invisible image produced after exposure and the role of AgBr in the photochemical process.
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