Physics 2007 JAMB Past Questions - Question 9: The energy E of a photon and its wavelength are related by E/.=X e - the numerical value of X is

Correct Answer

C

Explanation

The energy (E) of a photon and its wavelength (λ) are related by the equation:

E = h * c / λ

Where:
- E is the energy of the photon.
- h is the Planck constant, approximately 6.62607015 x 10^-34 joule seconds.
- c is the speed of light in a vacuum, approximately 299,792,458 meters per second.
- λ is the wavelength of the photon.

To find the numerical value of X, you can rearrange the equation as follows:

E/λ = h * c

Now, you can calculate the value of X using the given constants:

X = h * c

X ≈ (6.62607015 x 10^-34 J·s) * (299,792,458 m/s)

X ≈ 1.98644586 x 10^-25 J·m

So, the numerical value of X is approximately 1.98644586 x 10^-25 J·m.