Phosphorescence Flashcard

Front

Phosphorescence

Back

A type of luminescence that occurs when energy is provided by electromagnetic radiation.

Answer explanation

Phosphorescence is a type of luminescence that occurs when energy is supplied by electromagnetic radiation, allowing materials to absorb light and re-emit it over time.

Tags

CCSS.MATH.CONTENT.6.EE.A.1

Front

What is the main difference between phosphorescence and fluorescence?

Back

Phosphorescence releases energy slowly, while fluorescence releases it quickly.

Answer explanation

The main difference is that phosphorescence releases energy slowly over time, while fluorescence releases energy almost instantaneously when exposed to light.

Front

Example of a phosphorescent material: Incandescent bulbs, Glow-in-the-dark stars, Neon signs, LED lights

Back

Glow-in-the-dark stars

Answer explanation

Glow-in-the-dark stars are phosphorescent materials because they absorb light and re-emit it slowly, allowing them to glow in the dark. In contrast, incandescent bulbs, neon signs, and LED lights do not exhibit this property.

Front

What happens to electrons in phosphorescent materials when they absorb light?

Back

They move to an excited higher energy level.

Answer explanation

When phosphorescent materials absorb light, electrons gain energy and move to an excited higher energy state. This process allows them to store energy temporarily before eventually releasing it as light.

Front

What is the purpose of a Jablonski diagram?

Back

To show the difference between fluorescence and phosphorescence.

Answer explanation

A Jablonski diagram illustrates the electronic states of a molecule and the transitions between them, highlighting the differences between fluorescence and phosphorescence, making the second answer choice correct.

Front

Which compound is known to glow ten times brighter than zinc sulfide?

Back

Strontium aluminate

Answer explanation

Strontium aluminate is a phosphorescent material that glows significantly brighter than zinc sulfide, making it a popular choice for applications requiring intense luminescence.

Front

What is the historical significance of phosphorescence?

Back

It led to the discovery of radioactivity.

Answer explanation

Phosphorescence played a crucial role in the discovery of radioactivity, as it helped scientists understand the emission of energy from certain materials, leading to the identification of radioactive elements.

Front

What is the main reason that phosphorescent materials glow in the dark?

Back

They absorb and slowly release light energy.

Answer explanation

Phosphorescent materials glow in the dark because they absorb light energy and then slowly release it over time. This process allows them to emit light even after the external light source is removed.