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Tag: SG Education

  • Physics – Sound (speed of sound, echo)

    This post is about Physics – Sound (speed of sound, echo). Speed of Sound:Definition: The rate at which sound waves travel through a medium. Dependence on Medium: Temperature Effect:In gases, sound speed increases with temperature. Typical Speeds:Air (20°C): ~343 m/sWater: ~1,480 m/sSteel: ~5,960 m/s Echo:Definition: The reflection of sound waves off a surface back to…

  • Reactivities and Reactions of Metals

    This post is about Reactivities and Reactions of Metals. Here are some summary pointers. Reactivity of Metals Reactivity Series: Metals are ordered based on their reactivity from most reactive (potassium) to least reactive (gold). More reactive metals displace less reactive metals from compounds. Trends: Reactivity generally decreases down the reactivity series. Alkali metals (Group 1)…

  • All About Converging Len Ray Diagrams

    This post is All About Converging Len Ray Diagrams. Note that the focal length is the distance between an optical lens or mirror and its focal point, where parallel rays of light converge or appear to diverge. Key differences between convex and concave lenses: Shape:Convex Lens: Thicker at the center and thinner at the edges,…

  • Common O-Level Physics Mistakes (Part 2)

    In our last post, we talk about some common O-Level Physics mistakes (Part 1). This week, we’re diving into Part 2. Pressure in Fluids Common Misconception: Students sometimes confuse pressure with force.Pressure (P): Defined as the force per unit area, given by the formula P = F/Awhere F is the force applied and A is the…

  • Common O-Level Physics Mistakes (Part 1)

    In this post, we’ll talk about some Common O-Level Physics Mistakes. Here are some questions that O-level students get wrong (Part 1). Kinetic and Potential Energy Common Misconception: Sometimes students think that an object can have only one type of energy at a time, but an object can have both kinetic and gravitational potential energy…