SNC2D 11.2 Exam Review

T/F - The difference between light coming from the Sun and light coming from a tree is that the Sun radiates its own light, whereas the tree can only reflect light.

• True

• False

T/F -When an object is heated to the point that it glows, the process is called incandescence.

• True

• False

T/F -As the object gets hotter, the colours of light produced change from red, to orange, to yellow, to white, and then to bluish-white.

• True

• False

T/F -Both incandescent bulbs and neon tubes have the air removed from them.

• True

• False

T/F -More than 90% of the electric energy that passes through an incandescent bulb is converted to light energy.

• True

• False

T/F -A piece of metal glowing red is hotter than one glowing yellow.

• True

• False

T/F -Every time you see a flash of lightning or walk past a lit neon sign for a business you are seeing light from electric discharge.

• True

• False

T/F -Fluorescence involves passing electricity through a gas, causing the gas to glow.

• True

• False

T/F -The temperature of a neon bulb depends on the type of gas that is inside the bulb.

• True

• False

T/F -Phosphorescence the process of producing light by the absorption of ultraviolet light resulting in the emission of visible light over an extended period of time.

• True

• False