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import numpy as np
import os

vc_A = 2.99792458e+18  # speed of light: A/s
vc_m = 2.99792458e+8   # speed of light: m/s
h_Plank = 6.626196e-27 # Plank constant: erg s

def photonEnergy(lambd):
	""" The energy of photon at a given wavelength

	Parameter:
		lambd: the wavelength in unit of Angstrom
	Return:
		eph: energy of photon in unit of erg
	"""
	nu = vc_A / lambd
	eph = h_Plank * nu
	return eph