Grasp It

Why are Rain Clouds Grey? The reason why overcast days are so dismal T o understand why clouds can appear grey, you first need to know why they also appear white. It’s all to do with the reflection of light. Clouds are created when air and  water vapour  near the ground warms up and rises. As it gets uplifted, the water vapour  condenses, and the droplets join together to make clouds. The more condensation there is, the more droplets there are and the bigger the clouds become. When light from the Sun passes through these large aggregations of water vapour , the droplets scatter the light in all directions. The droplets are tiny and spread out enough to scatter the entire spectrum of light, which means that they will appear white. As more water droplets accumulate and the clouds get larger, less light is able to penetrate through the cloud. What we see from the g...

Exception Handling Writing error-free programs is the main objective of programmers. However, whenever a program is written for the first time, it usually contains errors. These errors are classified  mainly into three types, namely, compile-time errors, logical errors and run time errors. The compile-time errors and logical errors can be detected and removed by exhaustive testing and debugging. However, run-time errors are difficult to detect and trap. The run-time errors are usually referred to as exceptions. An exception is an unexpected event that occurs during the execution of a program and alters the normal flow of the program or terminates the program abnormally. The errors that can cause exceptions can range from simple programming errors, such as opening an invalid file for reading, invalid array index, etc., to serious errors such as running out of memory. Exceptions can be classified into two types, namely, synchronous exc...