A high-energy pulse of light, with wavelength 514nm, is launched into an optical fibre at a uniform temperature of 295 K. The backscattered spontaneous Raman radiation is detected. The Stokes spectrum peaks at 495 nm and is, at that wavelength, at a power Ievel 65 dB lower than that of the launched pulse. If fibre attenuation can be neglected, what will be the Ievel of the anti-Stokes radiation at 533 nm, compared with the launched power? What will the Ievel be at 300 K?