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Masks are used to clear the material of a semiconductor. It is done by exposing the silicon wafer to UV rays and then washing it in a solvent.

  • A positive photo mask is used to remove the film wherever the mask is clear
  • A negative photo mask is used to remove the opaque
  • A positive photo mask requires longer exposure than that of the negative
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Q: What is the difference between positive and negative masks?
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What is the difference between African and native American masks?

African masks are often used in cultural ceremonies and rituals to represent spirits or ancestors, while Native American masks are used for storytelling, healing, and ceremonial purposes. African masks tend to be more stylized and abstract, representing supernatural beings, while Native American masks often depict animals or ancestral spirits in a more naturalistic way. Additionally, African masks are typically made from wood, while Native American masks can be made from various materials such as wood, leather, or cloth.

The difference between m40 and m40A1 masks?

The M40A1 has a second skin and quick doff hood; the M40 does not. Reference TM 3-4240-339-10.

When donning the protective masks expell the air from your lungs before?

Perform negative pressure check.

What is the difference between a respirator and a ventilator?

"Respirator" is an old word used for the machine most health care personnel would today call a "ventilator". The only time I hear the word "respirator" used today is when talking about respirator masks, which are the specialized masks worn by health care workers when coming into close contact with tuberculosis patients.

Masks the true relationship between the independent and dependent variables?


What is the difference between a Vizard and an Arrancar?

arrancars are basically hollows that have been modified to be stronger,faster etc whereas vizards are shinigami who have undergone the hollowfication process but have learned to control their inner hollow (to an extent) and can put on/ remove their masks as they please

Why are African tribal masks important?

They are important because they are a scorce of communications between life and death.

Why are masks used in 'Oedipus Rex'?

That one to three people always play all of the non-chorus roles and that the masks heighten the dramatic effect are the reasons why masks are used in "Oedipus Rex" by Sophocles (495 B.C.E. - 405 B.C.E.).Specifically, the chorus tends to consist of twelve (12) members, all of whom wear identical masks since they are of like mind and opinion. The non-choral roles tend to be played by anywhere from one to three actors. The actors have different masks to differentiate between females and males and between roles, such as between messenger and royal. The use of masks therefore acts to advance the universality of the themes and the dramatic impact of the events and to keep the audience from being distracted by the actual, physical attributes of the individual actors.

What is the difference between modern day theater and ancient Greek theater?

The difference between modern day theatre and ancient Greek theater is that in ancient Greece only boys could act in the shows. The stages were tilted instead of the chairs for the audience and they used big two sided masks made of rock.

What are the masks in theater?

The masks are comedy and tragedy.

What is the Dewey decimal number for Masks?

It depends on what you are looking for. Masks in cultures would be the 390's. Photo books of masks, masks in theater, how to make masks, etc would be mixed through the 700's.

Greeks wore what to play more than one role in play?

Greeks wore masks while performing in plays to depict different characters and roles. These masks helped the audience easily identify different characters and emotions portrayed by the actors. Masks also allowed actors to easily switch between roles without the need for elaborate costume changes.