AIIMS 2019 Physics Mobility of Charge Carriers Assertion Reason Question

The assertion is true because electrons, being lighter and having higher mobility in a semiconductor, can move more freely under an electric field compared to holes, which are effectively the absence of electrons and have a greater effective mass. The reason is also true, as the mass of an electron (approximately 9.11 × 10⁻³¹ kg) is indeed less than that of a hole, which contributes to the higher mobility of electrons. Option B is incorrect because the reason directly explains the assertion, while options C and D are incorrect since both the assertion and reason are true. Understanding the mobility of charge carriers in semiconductors is crucial for grasping their electrical properties and applications in devices like diodes and transistors.