Bissoy.com
Doctors Medicines MCQs Q&A

What is the principle behind scanning tunneling microscope?

What is the principle behind scanning tunneling microscope? Correct Answer Quantum tunneling

Scanning tunneling microscope is based on the concept of quantum tunneling. It’s a phenomenon in which a wave function can propagate through a potential barrier. The tip of the microscope is brought very close to the surface for examination. A bias voltage is applied between the two which allows electrons to tunnel through the vacuum separating them.

Related Questions

Which of the following statements about optical microscope is/are correct? 1. Both the eyepiece and objective of a microscope are convex lenses. 2. The magnification of a microscope increases with increase in focal length of the objective. 3.The magnification of a microscope depends upon the length of the microscope tube. 4. The eyepiece of a microscope is a concave lens. Select the correct answer using the code given below:
Which of the following statements about optical microscope is/are correct?
1. Both the eyepiece and objective of a microscope are convex lenses.
2. The magnification of a microscope increases with increases in focal length of the objective.
3. The magnification of a microscope depends upon the length of the microscope tube.
4. The eyepiece of a microscope is a concave lens.
Select the correct answer:
Who were the inventers of scanning tunneling microscope?
Scanning tunneling microscope is a tool usually used to analyze an image at ____________
Children are in pursuit of a dog whose leash has broken. James is directly behind the dog. Ruby is behind James. Rachel is behind Ruby. Max is ahead of the dog walking down the street in the opposite direction. As the children and dog pass, Max turns around and joins the pursuit. He runs in behind Ruby. James runs faster and is alongside the dog on the left. Ruby runs faster and is alongside the dog on the right. Which child is directly behind the dog?
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 using the code given below.
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:
In case of compound microscope which of the following statements is/are correct? 1) The focal length of eye piece is larger than the focal length of the objective 2) The focal length of the eye piece is smaller than the focal length of the objective 3) The image produced in a normal optical microscope is real 4) The image produced in a normal optical microscope is virtual
In case of a compound microscope, which of the following statements is/are correct?
1. The focal length of the eyepiece is larger than the focal length of the objective.
2. The focal length of the eyepiece is smaller than the focal length of the objective.
3. The image produced in a normal optical microscope is real.
4. The image produced in a normal optical microscope is virtual.
Select the correct answer:
I. Vipul is sitting on the desk behind Mohini. II. Mohini is sitting on the desk behind Satya. III. Anoop is sitting on the desk ahead of Satya. IV. Satya is sitting on the desk behind Vipul. V. Vipul is sitting on the desk behind Anoop. If the first three statements are true, then