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Photography: Latent Image Formation and Emulsion Chemistry

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Photography: Latent Image Formation and Emulsion Chemistry

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Questions and Answers

What is the first step of the photochemical process in the formation of a latent image?

The development of the film

The production of the emulsion

The production of the latent image (correct)

The formation of the silver bromide crystal

What is the purpose of the gelatin in the silver bromide emulsion?

To act as a solvent for the silver bromide

To provide a protective coating for the film

To create electron traps within the silver bromide crystal (correct)

To act as a binder for the silver bromide particles

What is the purpose of the bromine ions in the silver bromide crystal structure?

To provide the positive charge for the ionic lattice

To absorb the photons during exposure

To provide the negative charge for the ionic lattice (correct)

To occupy the center of the crystal structure

Which of the following processes is not involved in the mechanism of latent image formation?

Redox reaction Signup and view all the answers

Where do the photon interactions typically occur during the exposure of the silver bromide crystal?

At the surface of the crystal Signup and view all the answers

Which theory explains the growth process of the latent image?

Both Gurney Mott and Mitchell Theories Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers