Which relation is wrong

Options

A. `1` Calorie `=4.18` Joules
B. `1=10^(-10)m`
C. `1MeV=1.6xx10^(-13)` Joules
D. `1` Newton `=10^(-5)` Dynes

Answer

To determine which relation is wrong among the given options, we will analyze each statement one by one.

### Step 1: Analyze the first relation
**Relation:** 1 calorie = 4.18 joules
**Analysis:** This is a well-known conversion factor in physics. It is correct that 1 calorie is equal to 4.18 joules.
**Conclusion:** This relation is correct.

### Step 2: Analyze the second relation
**Relation:** 1 = 10^(-10) meters
**Analysis:** This statement is incorrect. The correct conversion is that 1 meter is equal to 10^10 nanometers, not the other way around.
**Conclusion:** This relation is wrong.

### Step 3: Analyze the third relation
**Relation:** Charge on 1 electron = 1.6 x 10^(-19) coulombs
**Analysis:** This is a correct statement. The charge of an electron is indeed approximately 1.6 x 10^(-19) coulombs.
**Conclusion:** This relation is correct.

### Step 4: Analyze the fourth relation
**Relation:** 1 Newton = 10^(-5) Dynes
**Analysis:** To convert Newtons to Dynes, we use the conversion factors:
1 Newton = 1 kg·m/s²
1 kg = 1000 grams
1 m = 100 centimeters
Thus,
1 Newton = 1000 g * 100 cm/s² = 10^5 g·cm/s² = 10^5 Dynes.
The statement that 1 Newton = 10^(-5) Dynes is incorrect.
**Conclusion:** This relation is wrong.

### Final Conclusion
The relations that are wrong are:
- **B:** 1 = 10^(-10) meters
- **D:** 1 Newton = 10^(-5) Dynes

### Summary of the Wrong Relations
- Option B and Option D are the wrong relations.

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