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Waves

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Transverse and Longitudinal Waves

Subtopic

Transverse and Longitudinal Waves under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    How is wave speed calculated?

    A.

    v=f×λv = f \times \lambda

    B.

    v=f/λv = f / \lambda

    C.

    v=λ/fv = \lambda / f

    D.

    v=f+λv = f + \lambda

  2. 2.

    Which electromagnetic radiation is used to cook food in a kitchen appliance?

    A.

    X-rays

    B.

    Microwaves

    C.

    Radio waves

    D.

    Gamma rays

  3. 3.

    What is the name for the high-pressure regions in a longitudinal wave?

    A.

    Rarefactions

    B.

    Crests

    C.

    Troughs

    D.

    Compressions

Download the worksheet for Waves - Transverse and Longitudinal Waves to practice offline. It includes additional chapter-level practice questions.

The Electromagnetic Spectrum

Subtopic

The Electromagnetic Spectrum under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the relationship between the wavelength and the frequency of an electromagnetic wave?

    A.

    They are directly proportional.

    B.

    They are inversely proportional.

    C.

    They are equal to each other.

    D.

    They have no relationship.

  2. 2.

    Optical fibers primarily use which parts of the electromagnetic spectrum to transmit data?

    A.

    X-rays and Gamma rays

    B.

    Radio waves and Microwaves

    C.

    Visible light and Infrared

    D.

    Ultraviolet and X-rays

  3. 3.

    Which of the following is true regarding the danger of electromagnetic waves?

    A.

    Radio waves are the most dangerous because they are the longest.

    B.

    Visible light is the only dangerous part of the spectrum.

    C.

    High-frequency waves like Gamma rays are generally more dangerous to biological tissue.

    D.

    Low-frequency waves carry more energy and cause more damage.

Download the worksheet for Waves - The Electromagnetic Spectrum to practice offline. It includes additional chapter-level practice questions.

Reflection and Refraction

Subtopic

Reflection and Refraction under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A pool of water appears shallower than it actually is. This is due to:

    A.

    Reflection

    B.

    Refraction

    C.

    Diffraction

    D.

    Absorption

  2. 2.

    What is the name of the ray that strikes a surface?

    A.

    Reflected ray

    B.

    Normal ray

    C.

    Incident ray

    D.

    Emergent ray

  3. 3.

    Which of the following describes 'total internal reflection'?

    A.

    Light bending as it enters glass

    B.

    Light reflecting off a mirror

    C.

    Light reflecting back into a denser medium at the boundary

    D.

    Light spreading out into a rainbow

Download the worksheet for Waves - Reflection and Refraction to practice offline. It includes additional chapter-level practice questions.

Properties of Sound

Subtopic

Properties of Sound under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In a sound wave, what is a rarefaction?

    A.

    A point of maximum pressure

    B.

    A point of minimum pressure

    C.

    The start of the wave

    D.

    The end of the wave

  2. 2.

    What does it mean if a sound is 'ultrasonic'?

    A.

    It is very loud

    B.

    It is very fast

    C.

    It has a frequency too high for humans to hear

    D.

    It has a frequency too low for humans to hear

  3. 3.

    Which sound wave property is directly related to the energy it carries?

    A.

    Pitch

    B.

    Amplitude

    C.

    Wavelength

    D.

    Speed

Download the worksheet for Waves - Properties of Sound to practice offline. It includes additional chapter-level practice questions.

Wave Equation

Subtopic

Wave Equation under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In a vacuum, all electromagnetic waves have the same:

    A.

    Frequency

    B.

    Wavelength

    C.

    Speed

    D.

    Amplitude

  2. 2.

    Calculate speed if wavelength is 0.50.5 m and period is 22 seconds.

    A.

    1 m/s

    B.

    0.25 m/s

    C.

    4 m/s

    D.

    2.5 m/s

  3. 3.

    A wave with a frequency of 22 Hz has a period of:

    A.

    2 s

    B.

    0.5 s

    C.

    1 s

    D.

    4 s

Download the worksheet for Waves - Wave Equation to practice offline. It includes additional chapter-level practice questions.

Dispersion

Subtopic

Dispersion under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If you look through a glass prism at a white object, you often see colored edges. This is caused by:

    A.

    Refraction

    B.

    Reflection

    C.

    Dispersion

    D.

    Diffraction

  2. 2.

    In the context of light, what does the term 'Refraction' mean?

    A.

    Bouncing of light

    B.

    Bending of light as it enters a new medium

    C.

    Light traveling in a straight line

    D.

    The absorption of light

  3. 3.

    Which color has the largest wavelength in the visible spectrum?

    A.

    Violet

    B.

    Indigo

    C.

    Blue

    D.

    Red

Download the worksheet for Waves - Dispersion to practice offline. It includes additional chapter-level practice questions.

Imaging and Applications of Waves

Subtopic

Imaging and Applications of Waves under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Why does a red apple appear red under white light?

    A.

    It absorbs red light

    B.

    It reflects red light and absorbs other colors

    C.

    It transmits red light

    D.

    It creates its own red light

  2. 2.

    What is the purpose of the optic nerve in the human eye?

    A.

    To focus light

    B.

    To control light entry

    C.

    To carry signals to the brain

    D.

    To protect the eye

  3. 3.

    Which of the following materials is opaque?

    A.

    Clear glass

    B.

    Air

    C.

    A wooden door

    D.

    Pure water

Download the worksheet for Waves - Imaging and Applications of Waves to practice offline. It includes additional chapter-level practice questions.

Diffraction

Subtopic

Diffraction under Waves for Grade 9 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    As waves diffract through a gap, what happens to their direction of travel?

    A.

    They all continue straight

    B.

    They spread out over a range of angles

    C.

    They reverse direction

    D.

    They turn exactly 90 degrees

  2. 2.

    Which of the following waves has the longest wavelength and thus diffracts the most around buildings?

    A.

    Gamma rays

    B.

    X-rays

    C.

    Visible light

    D.

    Radio waves

  3. 3.

    The pattern of wave fronts becoming circular after a gap is a visual indicator of:

    A.

    Reflection

    B.

    Diffraction

    C.

    Refraction

    D.

    Absorption

Download the worksheet for Waves - Diffraction to practice offline. It includes additional chapter-level practice questions.