Question Discussion & Solution

The mirror image of this image is:

Hence, option (2) is the correct answer.

The correct answer is option 4, i.e. ZIP.

Additional Information

• Becquerel is the SI unit of radioactivity.
• 1 Becquerel = 1 disintegration/Second
  • Disintegration: As the radioactive elements are unstable they will disintegrate at any moment by emitting alpha or beta particles and form new elements called daughter elements which are completely different in both physical and chemical properties when compared to the elements they came from.
  • The rate of disintegration does not depend upon external factors like temperature, pressure, etc.

Refrigerator, furniture and television are needed in one house but these are not the necessary things. Without these three a house can be built but without the walls a house cannot be built.

CONCEPT:

• Semiconductor: The material which is not a good conductor or a good insulator is called a semiconductor.
  • For example: Silicon, Germanium, etc
• Intrinsic semiconductor: The pure form of semiconductor is called an intrinsic semiconductor.
• Extrinsic semiconductor: The impurity atoms added are called dopants and semiconductors doped with the impurity atoms are called extrinsic or doped semiconductors.

  • P-type semiconductor: The semiconductor having holes as majority charge carriers and electrons as a minority charge carrier is called as P-type semiconductor.

  • N-type semiconductor: The semiconductor having electrons as majority charge carriers and holes as a minority charge carrier is called as N-type semiconductor.

EXPLANATION:

• ​From the above discussion, we can say that electrons are the major charge carriers in n-type semiconductors.

• Elements of Group 5 have five valence electrons, i.e. 1 extra from the Group 4 elements.
• 4 out of 5 electrons get bonded with the neighboring Silicon atoms and 1 electron per atom remains extra with the Group 5 elements.