How can a non-luminous metal such as iron be made luminous?

A luminous object

A circular area of radius 1.0 cm is placed at a distance of 2.0 m from a poit source.Teh source emits light uniformluy in al directions. The line joining the sorce to the dcentre of the area is normal to the area. It ils found that 2.0xx1^-3 lumen of luminous flux is incident on the area. Calculate the total luminous flux emitted by the soure and teh luminous intensity of the source along the axis of the area.

How can a substance be made amorphous?

Dimensions of luminous flux are

A source emits 12.0 J of lightof wavelength 620 nm and 8.0 J of light of wavelength 580 nm per second. The relative luminosilty at 620 is 25% and that at 580 nm is 80%. Find a the total radiant flux, b. the total luminous flux and c. and luminous efficiency.

Mention two uses of the following metals and non-metals : (a) Iron (b) Aluminium (c) Gold (d) Oxygen (e) Iodine

The metallic ions (the cations) can be identify by performing flame test which is describe below. "Make a paste of the given salt in concentrated hydrochloric acid. Load the paste on a clean platinum wire and introduce it in a non-luminous bunsen burner flame. Note the colour of the flame imparted by the flame. Tabulate your answer in the formate given below. The salt x imparts golden yellow flame. The salt y imparts lilac flame and the salt z imparts bright red flame.

Why do alkali metals show characteristic colours in a non luminous flame?

Cell organelle that divides intracellular space of a cell into two compartment luminal space and extra luminal space