According to electromagnetic theory of radiation s in photo electric effect which of these statement is incorrect ?

Options

A. only those radiations will be able to emit electrtrons from the metal surface whose frequaency is greater than threshold frequency
B. all the radiations will be able to emit electron form the metal surface
C. there should be no time gap between absorption of photon and emission of electron
D. higher the frequency of incident radiation more will be the kinetic energy associated with the electron

Answer

To determine which statement is incorrect according to the electromagnetic theory of radiation in the photoelectric effect, let’s analyze the provided options step by step.

### Step 1: Understand the Photoelectric Effect
The photoelectric effect refers to the phenomenon where electrons are emitted from a material (usually a metal) when it is exposed to light (or electromagnetic radiation) of sufficient frequency. According to the theory, only light with a frequency above a certain threshold can cause this emission.

### Step 2: Analyze Each Statement
1. **Option A**: "Only those radiations will be able to emit electrons from the metal surface whose frequency is greater than the threshold frequency."
- This statement is **true**. According to Einstein's photoelectric equation, the energy of the incoming photon must be greater than the work function of the metal to emit electrons.

2. **Option B**: "All radiation will be able to emit electrons from the metal surface."
- This statement is **incorrect**. Not all radiation can emit electrons; only those with a frequency greater than the threshold frequency can do so.

3. **Option C**: "There should be no time gap between absorption of photon and emission of electron."
- This statement is **true**. The emission of electrons occurs almost instantaneously after photon absorption, as there is no significant delay in the process.

4. **Option D**: "Higher the frequency of incident radiation, more will be the kinetic energy associated with the emitted electron."
- This statement is **true**. As the frequency increases, the energy of the photon increases, leading to more kinetic energy for the emitted electrons after overcoming the work function.

### Step 3: Conclusion
Based on the analysis:
- The **incorrect statement** is **Option B**: "All radiation will be able to emit electrons from the metal surface."