Question

The wire of flashbulb is made up of:
A. $Cu$
B. $Mg$
C. $Ag$
D. $Ba$

Answer 1

The flashbulb was created as a safer alternative to flash powder, which is used to provide artificial light for photography, especially indoors. The Vacu-blitz, developed by Hauff-Leonar AG in Germany in $1929$, was the first commercially marketed flashbulb.

Complete answer:
Austrian Paul Vierkotter used magnesium coated wire in an evacuated glass globe to create the first modern photoflash bulb (or flashbulb). Aluminium foil in a low-pressure oxygen atmosphere was later discovered to function much better and be less expensive to make.
Magnesium burns with an intense light. Therefore, it is used in flashbulbs for photography, fireworks and signal fires.
Magnesium is an alkaline earth metal with a silvery white colour. Because it burns with a brilliant white flame, it is used to manufacture strong lightweight alloys as well as flashbulbs for pyrotechnics. Magnesium is also used in flares, fireworks, and sparklers because it ignites easily in air and flames brightly.
Magnesium is a necessary component of plant and animal life. Chlorophyll is a molecule that helps plants to absorb sunlight and perform photosynthesis. Chlorophyll is a porphyrin compound with a magnesium centre. Photosynthesis would not be possible without magnesium, and life as we know it would cease to exist.
Hence, the correct option is B. $Mg$ .

Note:
Magnesium is the eighth most plentiful element on the planet, accounting for around $2\%$ of the earth's crust. It is the most abundant element found in seawater. It can be found in subsurface brines and salty layers as well as in seawater. Magnesium is the third most prevalent structural metal in the earth's crust, after aluminium and iron.