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SingaporePhysics

Waves, Light and Sound

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What is a wave, and how are its speed, frequency, and wavelength related?

Define wave terms such as amplitude, wavelength, frequency, and period, and apply the wave equation
A focused answer to the O-Level Physics outcome on wave properties. Transverse and longitudinal waves, amplitude, wavelength, frequency, period, the wave equation, and how waves transfer energy without transferring matter.
8 min answer →

How does light bounce off mirrors and bend when it passes between materials?

State the laws of reflection and refraction, define refractive index, and describe total internal reflection
A focused answer to the O-Level Physics outcome on reflection and refraction. The law of reflection, refraction and Snell's law, refractive index, the critical angle, and total internal reflection with its uses.
8 min answer →

What makes up the electromagnetic spectrum, and how do sound waves travel?

Describe the electromagnetic spectrum and its uses, and explain how sound waves are produced and travel
A focused answer to the O-Level Physics outcome on the electromagnetic spectrum and sound. The order of the EM spectrum, common uses and dangers, the speed of light, and how sound is a longitudinal wave needing a medium.
8 min answer →

How does a converging lens form an image, and what kind of image does it produce?

Describe how a thin converging lens forms images and use ray diagrams and the focal length
A focused answer to the O-Level Physics outcome on converging lenses. The principal focus and focal length, drawing ray diagrams, the nature of real and virtual images, and how images change as the object moves.
8 min answer →