11) Calculate the wavenumber in cm^-1 of an infrared absorption peak at 785 mHz. A) 2.62times 10^-9cm^-1 B) 3.82times 10^8cm^-1 C) 2.36times 10^8cm^-1 D) 4.24times 10^-9cm^-1 B) 2.55times 10^-6cm^-1

To calculate the wavenumber in of an infrared absorption peak at 785 MHz, we can use the formula:Wavenumber = 1 / (wavelength in meters)First, we need to convert the frequency from MHz to Hz:785 MHz = 785 x 10^6 HzNext, we can use the speed of light (c) to find the wavelength:c = 3 x 10^8 m/sWavelength = c / frequencyWavelength = (3 x 10^8 m/s) / (785 x 10^6 Hz)Wavelength = 0.382 x 10^-6 mNow, we can calculate the wavenumber:Wavenumber = 1 / (wavelength in meters)Wavenumber = 1 / (0.382 x 10^-6 m)Wavenumber = 2.62 x 10^9 Therefore, the correct answer is A) .