1) A wave has a frequency of 0.25 Hz. It travels a distance of 100 m in 40 s. Calculate how many cycles the wave completes during this journey.

2) A microwave uses light of frequency 2.455 GHz. Using the below equation, calculate the wavelength of this light. (Take the speed of light to be c = 3.00 x 10⁸ m s^-1.) Express your answer in centimetres to an appropriate number of significant figures.

H frequency x wavelength