When we studies antennas we found that passing electric fields created currents

Question

When we studies antennas we found that passing electric fields created currents in conductors. We explained this using the wave model. What other experimented are successfully explained using the wave mode? Explain. Show below is the electric field component of two different electromagnetic waves E_1 and E_2 Also shown are two electrons ()at different locations a and b. which electron currently feels a greater force from E_1? Explain. According to the wave model, which electromagnetic wave (E_1 or E_2) is more likely to free an electron from a metal (discuss in terms of force, intensity and time). Explain. According to the photon model for light, will photons coming from E_1 or E_2 be more likely to free electrons from a metal? (Discuss in terms of force, intensity and time) Explain. Which model of light do experiments agree? Clearly state any glaring discrepancies in the two models Explain.

Explanation / Answer

1. wave model is also used to describe the experiments related to diffraction of light, and interference of light

in both the experiments, the light, insteead of behaving like a particle behaves like a wave and hence bending around sharp edges

and interfaring to have maximas and minimas are explained in both these experiments respectively

2. The electron at B would face more force if wave model is applied becuase

force on a charged particle = qE where E is magnitude of the electric field at the point

now, as electric field has higher magnitude at B, the force on B is greater

3. Hence according to wave model, the electron at B has higher chance to be freed form the metal, as it is getting acted upon with a greater force

4. According to photohn model, the energy of the photon is proportional to the frequency of the electric field ( frequerncy of the light)

now, the frequency of the electric fields is the same for both electric fields, so both photons have same energy

hence, noth electrons have equal chance of being freed from the metal as all the photons acting on it are of the same energy, from the photon mopdel

5. in this experiment, the photon model is applicable as experiments show that with below a threshold frequency electrons wont get free from the metal and this can be explained using photon principle olny. both the explainations of behaviour of light are correct, but the behavious is never simultaneous and depenmds on the experiment

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