Sydneyâs coolest months are June to August when average temperatures drop between 8.8 - 17Â°C (47.8 - 62.6Â°F). Sydneyâs rainfall is generally highest in June, with an average of 132 mm (5.2â), while July is the coolest month when average daytime temperatures reach just 13Â°C (55Â°F). Spring (September â November)
The human ear responds to sounds with frequencies in the range from 20 Hz to 20,000 Hz. This is called the audible range of the human ear.
In the electromagnetic spectrum, as the wavelength decreases, the frequency and the energy of the wave increase. The types of EM radiation, listed in order of increasing energy, are: The energy levels of these waves varies from approximately 0.2 microelectron volts (radio waves) up to nearly 2.5 million electron volts (gamma rays).