
# Constants
eV_to_J = 1.602 * 10**-19  # Conversion factor from eV to J
h = 6.626 * 10**-34  # Planck's constant in J*s

# Convert phi from eV to J
phi_eV = 2.28
phi_J = phi_eV * eV_to_J

# Calculate v0 and convert it to 10^14 Hz
v0 = phi_J / h / (10**14)
print(v0)

