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What is the separation kept between the tip and sample while raster scanning of the sample?

What is the separation kept between the tip and sample while raster scanning of the sample? Correct Answer 4Å -7Å

The tip and sample separation must be kept around 4-7Å or 0.4-0.7 nm. The range should not fall below 3Å where repulsive interactions are dominant. It should be within 3Å and 10Å since attractive forces become prominent here.

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In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person?
1. Iris scanning
2. Retinal scanning
3. Voice recognition
Select the correct answer:
মিলিটারী কোডে RASTER যদি RASTER হয় এবং VECTOR যদি হয় CEVTOR তাহলে REGTIONAL কি হবে?
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