14 days. of rain. Singapore's total amount of rain for April has varied over the years from 18 inches (455 mm) to less than an inch (17 mm). Usually the day's heaviest rainfall this time of year occurs around 5 pm.Sunlight in April at Singapore lasts for 12 hours and 8 minutes a day on average.That amounts to 364 hours of daylight for the month. The relative humidity in Singapore during April ranges throughout the day from an average maximum of 97 percent to an average minimum of 63 percent.ingapore's total amount of rain for April has varied over the years from 18 inches (455 mm) to less than an inch (17 mm).
1 An example of light energy is the movement of a radio signal. 2  An example of light energy is the energy in the brain that transmits signals for movement, memory, speech and hearing.
Radiation is energy that comes from a source and travels through space and may be able to penetrate various materials. Light, radio, and microwaves are types of radiation that are called nonionizing. Examples of some alpha emitters: radium, radon, uranium, thorium. 2  Most alpha radiation is not able to penetrate human skin. 3  Alpha-emitting materials can be harmful to humans if the materials are inhaled, swallowed, or absorbed through open wounds. 4  A variety of instruments has been designed to measure alpha radiation.