The Scout Association of Hong Kong 24th Tsuen Wan Group is sponsored by Yan Chai Hospital and under the monitoring of Yan Chai Hospital Lim Por Yen Secondary School.
E, energy of a photon
h, Planck's constant
f, frequency of the photon
c, speed of light = 300 000 km/s
f, frequency of wave, from 1 Hz to 10^24 Hz
X, wavelength of wave, from 10^8 m to 10^-16 m