The ratio of the power of a light source S1 S_1 S1 to that of the light source S2 S_2 S2 is 2. S1 S_1 S1 is emitting 2×1015 2 \times 10^{15} 2×1015 photons per second at 600 nm. If the wavelength of the source S2 S_2 S2 is 300 nm, then the number of photons per second emitted by S2 S_2 S2 is ________________ ×1014 \times 10^{14} ×1014.