Which of the following was most clearly, even uniquely perhaps, revealed by the discovery of the photoelectric effect?

1. the heisenberg uncertainty principle (the
indeterminate, probabilistic character of nature)

2. energy/quantization

3. wave/particle duality

4. superconductivity

5. relativity

The discovery of the photoelectric effect reveals.

Further explanation:

Photoelectric effect is the phenomenon in which metals having certain minimum frequency emits electron when exposed to electromagnetic radiation. The electrons emitted are called as photoelectrons.

The electrons are emitted as a result of absorption of energy from electromagnetic radiation of high frequency. Electromagnetic radiation such as ultraviolet light excites electrons to higher energy level called as an excited state of electrons.

Some features of photoelectric effects are written as follows:

1. The energy of photon is proportional to frequency of light.

2. A certain minimum frequency called as threshold frequency is needed by metal to emit electrons below which no electron are emitted. It is denoted by .

3. Kinetic energy of electron is proportional to frequency of electromagnetic radiation.

4. Number of electrons emitted per second is proportional to intensity of light.

Wave-particle duality is the phenomenon in which photon exhibit properties of both particle and wave.

According to photoelectric effect, light can exhibit both particle as well as wave nature. Each photon carries definite amount of energy that is directly proportional to frequency and behaves as a particle.

On the other hand, when light hits metal surface having certain minimum frequency it causes emission of electrons. The minimum amount of energy and frequency translates into a maximum wavelength. Therefore light propagates and interacts with metal surface to eject electron as it is a wave.

Hence the phenomenon of wave-particle duality is best revealed by discovery photoelectric effect.

Learn more:

1. What is the charge associated with each molecule of HCl

2. Write the chemical equation

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Photoelectric effect

Keywords: Photon, photoelectric effect, energy, metals, light, particle, electromagnetic radiation, frequency, threshold frequency, kinetic energy and wave-particle duality.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.