Chl has an absorbance peak at 435nm (Soret band) and a peak at 665nm (Qytransition). Calculate the energy gap (in Joules) between the ground and excited states of these two transitions.

To calculate the energy gap between the ground and excited states for each transition, you can use the formula:

ΔE = hc/λ

Where:
ΔE is the energy gap (in joules)
h is Planck's constant (6.626 x 10^-34 J·s)
c is the speed of light (3.00 x 10^8 m/s)
λ is the wavelength of the absorbance peak (in meters)

For the Soret band (at 435nm):
Convert the wavelength to meters by dividing it by 10^9 to have it in meters.

λ = 435nm = 435 x 10^-9 m

Now, we can calculate the energy gap:

ΔE_soret = (6.626 x 10^-34 J·s) × (3.00 x 10^8 m/s) / (435 x 10^-9 m)

For the Qy transition (at 665nm):
Convert the wavelength to meters as before:

λ = 665nm = 665 x 10^-9 m

Now, we can calculate the energy gap:

ΔE_Qy = (6.626 x 10^-34 J·s) × (3.00 x 10^8 m/s) / (665 x 10^-9 m)

Calculate both ΔE_soret and ΔE_Qy, and you will have the energy gap for each transition in joules.