Physics: Waves: Units
Overview
A wave is described by only a handful of numbers: how long it is, how often it repeats, how fast it moves and what angle it strikes a surface at. Each of those numbers is useless without the unit that goes with it, and the Waves section leans on just five of them.
This lesson sets out the degree, the hertz, the metre, the metre per second and the second: what each one measures, which are built from the others, how to move between prefixes such as MHz and nm, and how a quick unit check can catch a wrong answer before the examiner does.
Objectives
- Use the following units: degree, hertz (Hz), metre (m), metre/second (m/s) and second (s)
Mind map
This topic is mapped out so you can see how the ideas connect.
Open the mind map in the app
Flashcards
Quick recall practice on the facts this topic is tested on.
Practise these cards in the app
Lesson Note
Complete Note Available on the Green Bridge App
Get the Green Bridge CBT app on your phone or computer for the complete IGCSE library: past papers, mark schemes, mind maps, flashcards and audio lessons.
Lesson Evaluation
Congratulations on completing the lesson on Physics: Waves: Units. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The unit of frequency is the: A) metre B) second C) hertz D) degree Answer: C
- A wave has a period of 0.5 s. Its frequency is: A) 0.5 Hz B) 2 Hz C) 5 Hz D) 50 Hz Answer: B
- Which quantity is measured in metres? A) Frequency B) Period C) Wavelength D) Wave speed Answer: C
- 2.5 MHz written in hertz is: A) 2500 Hz B) 250000 Hz C) 2500000 Hz D) 25000000 Hz Answer: C
- Angles of incidence and reflection are measured in degrees from the: A) surface B) normal C) reflected ray D) horizontal Answer: B
Work through these questions in the app
Work through these questions in the app
Practice Mock Questions
Want to practice mock questions on Physics: Waves: Units? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
