A cube of unit volume contains 35 × 10⁷ photons of frequency 10¹⁵ Hz. If the energy of all the photons is viewed as the average energy being contained in the electromagnetic waves within the same volume, then the amplitude of the magnetic field is α × 10⁻⁹ T. Taking permeability of free space μ₀ = 4π × 10⁻⁷ Tm/A, Planck’s constant h = 6 × 10⁻³⁴ Js and π = 22/7, the value of α is ____