I think it is called an audit trail.
Answer:
A. simple to construct and easy to repair
Explanation:
A dynamic microphone works on the principle of electromagnetic principle. A diaphragm is attached to a coil of wire which helps in producing sound. Responding to the sound waves, the coil of the wire is vibrated by the diaphragm. A magnetic field is created by the magnet which is present inside the coil of wire. The electrical signal is generated in response to the motion of the coil. The speed of the motion produces the amount of the current.
Since the construction of a dynamic microphone is easier as compared to any other microphone, John is likely to opt to build one.
Answer:
A. Smart card
Explanation:
Smart cards contain a chip that can store a large amount of information as well as on a magnetic stripe for backward compatibility.
Smart card are cards made of plastic or metal material that has an embedded integrated chip that acts as a security token. Smart cards are the same size as a debit or credit card.
They connect to a reader either by a chip (microcontroller or an embedded memory chip) or through a short-range wireless connectivity standard such as radio-frequency identification or near-field communication.
It can be used to perform various functions though most commonly are used for credit cards and other payment cards.
A user can add a shadow to a table on Power Point presentation, b<span>y choosing the Layout tab under Table Tools, clicking on Effects, and selecting Shadow. The shadow can be inner, outer or perspective. The most commonly used is outer shadow.
</span>Adding a shadow behind the table will make the <span>data table to stand out on the screen and help bring the viewer’s attention.
Shades can be added also on text, tables, pictures inserted in the presentation and other object. </span>
You might have to get one of these i use it at home for many things like this. You can use it for any type of speaker or audio plug in.
https://www.google.com/search?q=3.55+mm+jack&rlz=1C1GGRV_enUS758US758&tbm=isch&source=iu&ictx=1&fir=...: