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At some particular temperature, in the unit volume of an intrinsic semiconductor, the number of the broken covalent bonds is equal to 0 (Zero).    In this particular semiconductor, at this particular temperature, what can you say about the mobile carrier concentration? (build the matching pairs).

Which of the following determines a particular intensity of light (encircle ALL answers that apply)

Which of the following determines a particular color of light (encircle ALL answers that apply)

Photoelectric effect is when electrons escape from a metal when it is illumination with a light. In the given experiment, a particular number of electrons are escaping every second. Each of those electrons have the same particular value of the Kinetic energy.What will happen when the only change in your experiment is that you use a different metal that has a higher Work-function?  

Before the Bohr’s model was introduced, it was believed that certain values are continuous (not discrete). Instead, the Bohr’s model suggested that those  values are “quantized” (discrete). What are those values that are “quantized” according to the Bohr’s model.  (Select All that apply)

Which of the following planes is parallel to the X axis? (Hint: we have X, Y and Z axes, which correspond to basis vectors a, b and c) Encircle All that apply. 

Which of the following are the units of concentration (e.g., concentration of free carriers)? Encircle All that apply. 

In an electron diffraction experiment, an obstacle with 2 narrow slits is placed in the way of a beam of electrons, before the beam hits a screen on the other side. We know that a diffraction pattern may be observed on the screen. What can you say about a single electron that passed through a slit?

The Occupational Health and Safety Act (OHSA) emphasise the responsibility for a safe and risk-free working environment on the employer, with a few exclusions for employees.

The Mine Health and Safety Act (MHSA) No. 29 of 1996 is an outcome-based and non-prescriptive law. Which key structural element does the MHSA primarily rely on to achieve its objectives of protecting health and safety at mines?