Exploring the Scanning Tunnelling Microscope and Its Applications

Why are basic microscopes that use light no longer sufficient for examining certain structures?

• They require too much maintenance.

• They are too complex to use.

• They cannot examine structures at a subatomic level.

• They are too expensive.

What type of device is a scanning tunneling microscope (STM)?

• An optical device

• A mechanical device

• A non-optical device

• A thermal device

What principle does the STM use to produce a digital image of a specimen?

• Classical mechanics

• Quantum mechanics

• Thermodynamics

• Electromagnetism

What is the main component of an STM that interacts with the specimen?

• A magnetic field

• An extremely sharp metal tip

• A glass lens

• A laser beam

What is the effect called when electrons jump from the STM tip to the specimen?

• Quantum leap

• Electron hopping

• Quantum tunneling

• Electron diffusion

What is generated when electrons flow in a complete circuit in an STM?

• A magnetic field

• A tunneling current

• A light beam

• A thermal current

How does the STM produce a map of the specimen?

• By using the fluctuating tunneling current

• By measuring the thermal conductivity

• By using a laser beam

• By measuring the light reflection

What additional function does the STM have besides mapping an image?

• Measuring the specimen's weight

• Cooling the specimen

• Repositioning and inserting atoms

• Heating the specimen

In which fields of science is the STM used?

• Only in electronics

• Only in biology

• Only in chemistry

• In all fields of science

Why is the STM considered a crucial instrument?

• It helps increase our knowledge of subatomic particles.

• It is portable.

• It is easy to use.

• It is very affordable.