Which one is incorrect statement?

Options

A. Redioactiv ecarbon can be used to determine the age of fossils upto 150,000 - 2000,000 years old
B. K- Ar method is usefull because K is common element found all short of rocks
C. K-Ar method has been used to determine the age of Homind fossils in east Africa
D. Electron spin resonance method is relative most accurate method for dating of fossils

Answer

To determine which statement is incorrect, we will analyze each statement provided in the question step by step.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- The first statement claims that "radioactive carbon can be used to determine the age of fossils up to 1.5 million to 2 million years old."
- **Analysis:** The half-life of carbon-14 is approximately 5730 years. This means that carbon dating is effective for dating fossils up to about 40,000 years old. Therefore, using carbon dating for fossils that are 1.5 to 2 million years old is incorrect.
- **Conclusion:** This statement is incorrect.

2. **Evaluate the Second Statement:**
- The second statement states that "Potassium argon method is useful because potassium is a common element found in all sorts of rocks."
- **Analysis:** Potassium is indeed a common element in many types of rocks, and the potassium-argon dating method is widely used in geology and archaeology. The half-life of potassium-40 is about 1.25 billion years, making it suitable for dating older geological formations.
- **Conclusion:** This statement is correct.

3. **Evaluate the Third Statement:**
- The third statement claims that "Potassium argon method has been used to determine the age of hominoid fossils in East Africa."
- **Analysis:** This statement is true as the potassium-argon method has been used to date early hominoid fossils found in East Africa.
- **Conclusion:** This statement is correct.

4. **Evaluate the Fourth Statement:**
- The fourth statement says that "electron spin resonance method is relatively the most accurate method for dating of fossils."
- **Analysis:** The electron spin resonance (ESR) method is indeed a highly accurate dating method and can be used for materials that cannot be dated using other methods. It is effective for dating fossils and other materials.
- **Conclusion:** This statement is correct.

### Final Conclusion:
- The only incorrect statement among the options is the first one regarding radioactive carbon dating. Therefore, the answer to the question is that the first statement is incorrect.