What phenomenon describes the emission of electrons from a metal caused by light striking the metal?

Prepare for the Electromagnetic Spectrum and Light Test. Engage with interactive questions and insights. Ensure success in your exam!

Multiple Choice

What phenomenon describes the emission of electrons from a metal caused by light striking the metal?

The phenomenon that describes the emission of electrons from a metal due to light striking it is known as the photoelectric effect. This effect occurs when photons, which are packets of light energy, hit the surface of a metal and transfer their energy to the electrons in the metal. If the energy of the incident photons is sufficient to overcome the work function of the metal (the minimum energy required to release an electron), the electrons are ejected from the metal's surface. This phenomenon was first observed by Heinrich Hertz in 1887 and later explained by Albert Einstein, who provided a theoretical foundation that confirmed the particle-like behavior of light. The photoelectric effect is critical in numerous applications, including photovoltaic cells, light sensors, and photoelectron spectroscopy. The other options refer to different concepts. Photodissociation involves the breaking of chemical bonds in molecules due to the absorption of light energy but does not pertain to the emission of electrons from metals. Electromagnetic induction relates to the production of voltage across a conductor exposed to a changing magnetic field, and thermal emission refers to the release of energy from matter due to its temperature, neither of which are connected to the emission of electrons from metals due to light exposure.

The phenomenon that describes the emission of electrons from a metal due to light striking it is known as the photoelectric effect. This effect occurs when photons, which are packets of light energy, hit the surface of a metal and transfer their energy to the electrons in the metal. If the energy of the incident photons is sufficient to overcome the work function of the metal (the minimum energy required to release an electron), the electrons are ejected from the metal's surface.

This phenomenon was first observed by Heinrich Hertz in 1887 and later explained by Albert Einstein, who provided a theoretical foundation that confirmed the particle-like behavior of light. The photoelectric effect is critical in numerous applications, including photovoltaic cells, light sensors, and photoelectron spectroscopy.

The other options refer to different concepts. Photodissociation involves the breaking of chemical bonds in molecules due to the absorption of light energy but does not pertain to the emission of electrons from metals. Electromagnetic induction relates to the production of voltage across a conductor exposed to a changing magnetic field, and thermal emission refers to the release of energy from matter due to its temperature, neither of which are connected to the emission of electrons from metals due to light exposure.

More practice questions