اختبار دكتور فواز

عرف الضوء

الليزر

• متعدد الالوان

• احادي اللون

• ثنائي اللون

• غير ذلك

What does the letter 'S' in the acronym LASER represent?

• Spontaneous

• Stimulated

• Spectral

• Stable

Which property of laser light means that all its photons have the same wavelength?

• Directionality

• Coherence

• Monochromatic

• Amplification

الليزر احادي ام متعدد الالوان

• متعدد

• احادي

• احادي ومتعدد

What is the fundamental source of all light in the universe?

• Chemical reactions

• Excitation of atomic electrons

• Nuclear fusion

• Gravitational forces

Which characteristic describes the photons emitted during spontaneous emission?

• They travel in a single, coherent direction.

• They have random directions and phases.

• They are always absorbed by other electrons.

• They have higher energy than the absorbed photon.

What is the primary difference between spontaneous emission and stimulated emission?

• Spontaneous emission requires an external photon, while stimulated emission does not.

• Stimulated emission produces coherent photons, while spontaneous emission produces incoherent photons.

• Spontaneous emission occurs only in gases, while stimulated emission occurs only in solids.

• Stimulated emission results in the electron moving to a higher energy level, while spontaneous emission results in it moving to a lower level.