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.
$In a longitudinal wave, the distance between two adjacent compressions is called the:$
A. $Amplitude$
B. $Frequency$
C. $Wavelength$
D. $Period$
2.
$What is the standard unit for the period of a wave?$
A. $Hertz$
B. $Meters$
C. $Seconds$
D. $Meters per second$
3.
$A wave moving along a guitar string when it is plucked is:$
A. $Transverse$
B. $Longitudinal$
C. $Electromagnetic$
D. $Vacuum-based$

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.
$What is the relationship between the wavelength and the frequency of an electromagnetic wave?$
A. $They are directly proportional.$
B. $They are inversely proportional.$
C. $They are equal to each other.$
D. $They have no relationship.$
2.
$Optical fibers primarily use which parts of the electromagnetic spectrum to transmit data?$
A. $X-rays and Gamma rays$
B. $Radio waves and Microwaves$
C. $Visible light and Infrared$
D. $Ultraviolet and X-rays$
3.
$Which of the following is true regarding the danger of electromagnetic waves?$
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.
$A pool of water appears shallower than it actually is. This is due to:$
A. $Reflection$
B. $Refraction$
C. $Diffraction$
D. $Absorption$
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.
$Which of the following describes 'total internal reflection'?$
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.
$In a sound wave, what is a rarefaction?$
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.
$What does it mean if a sound is 'ultrasonic'?$
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.
$Which sound wave property is directly related to the energy it carries?$
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.

Waves - IB Grade 9 Science Notes & Revision | Krit.club