Which of the following is not correct ?

Options

A. `lamda=v//c`
B. `E=mc^(2)`
C. `h=E//v`
D. `lamda=h//p`

Explanation

To solve the question, we need to analyze the given equations and determine which one is not correct.

### Step-by-Step Solution:

1. **Identify the Variables**:
- \( \lambda \) = Wavelength
- \( \nu \) = Frequency
- \( c \) = Speed of light
- \( h \) = Planck's constant
- \( E \) = Energy
- \( p \) = Momentum
- \( m \) = Mass

2. **Review the Equations**:
- The first equation involves the relationship between wavelength, frequency, and the speed of light:
\[ c = \lambda \nu \]
- The energy of a photon is given by:
\[ E = h \nu \]
- Substituting \( \nu \) from the speed of light equation into the energy equation gives:
\[ E = \frac{hc}{\lambda} \]

3. **Check Each Statement**:
- **Statement 1**: If it states something like \( \nu = \frac{c}{\lambda} \), this is correct.
- **Statement 2**: If it states \( E = h \nu \), this is also correct.
- **Statement 3**: If it states \( E = \frac{hc}{\lambda} \), this is correct as well.
- **Statement 4**: If it states something incorrect like \( \lambda = \frac{u}{c} \) (where \( u \) is not defined in the context), this would be incorrect.

4. **Identify the Incorrect Statement**:
- From the analysis, the equation that is not correct is likely the one that misrepresents the relationship between wavelength and speed of light, such as \( \lambda = \frac{u}{c} \).

### Conclusion:
The statement that is not correct is the one that incorrectly relates the variables, specifically the one that states \( \lambda = \frac{u}{c} \).