Question

Q 23. Choose the correct pair among the following i) TEM-Transmission electron microscopy ii) SEM-Scanning electron microscopy iii) STM-Scanning transmission microscopy iv) TEM-Tunneling electron microscopy a. O i, ii, iv only b. O ii, iii only C. O iii, iv only d. O i, iv only​

Answer 1

Answer:

only 1 and 2 full form is correct

TEM — Transmission Electron microscopy.

SEM —Scanning Electron Microscopy.

Answer 2

Answer:

I) and II) are correct only.

Explanation:

I) TEM: Transmission electron microscopy ( correct )

• It is an analytical device for visualization and evaluation of specimens and then reveals the detail and complexity of a specimen by the usage of focused beams of high energy electrons.

II) SEM: Scanning electron microscopy ( correct )

• It uses the surface of specimens for observation. The surface of the specimen is radiated with a fine electron beam and then secondary electrons are emitted from the surface which help in image projection.

III) STM: Scanning transmission microscopy ( incorrect )

              Scanning tunneling microscopy  ( correct )

• It provides high atomic resolution images by passing a tunneling current between a conductive tip and a semiconductive or conductive surface.

IV) TEM: Tunneling electron microscopy  ( incorrect )

        Transmission electron microscopy  ( correct )

RESULT: I) and II) are correct only.