Podcast
Questions and Answers
Which of the following is an example of a transverse wave?
Which of the following is an example of a transverse wave?
- Slinky compression
- Water ripples (correct)
- Earthquake P-waves
- Sound
The amplitude of a sound wave is related to its pitch.
The amplitude of a sound wave is related to its pitch.
False (B)
What is the unit of frequency?
What is the unit of frequency?
Hertz (Hz)
The speed of sound in air is approximately _____ m/s.
The speed of sound in air is approximately _____ m/s.
Match the following wave properties with their descriptions:
Match the following wave properties with their descriptions:
What type of lens causes light rays to converge?
What type of lens causes light rays to converge?
A concave lens creates real images that can be projected onto a screen.
A concave lens creates real images that can be projected onto a screen.
What happens to light rays when they pass into a denser medium?
What happens to light rays when they pass into a denser medium?
A _______ lens is used to magnify images and is often found in microscopes.
A _______ lens is used to magnify images and is often found in microscopes.
Which of the following describes a virtual image?
Which of the following describes a virtual image?
Magnification is calculated by dividing the _______ size by the actual size.
Magnification is calculated by dividing the _______ size by the actual size.
Match the type of lens with their effects on light:
Match the type of lens with their effects on light:
How can a lens be made more powerful?
How can a lens be made more powerful?
What is the characteristic of the image formed by a convex lens when the object is placed beyond the focal point?
What is the characteristic of the image formed by a convex lens when the object is placed beyond the focal point?
The image formed by a concave lens can be both real and inverted.
The image formed by a concave lens can be both real and inverted.
What is the formula for calculating magnification?
What is the formula for calculating magnification?
The image formed by the concave lens is always _______ and __________.
The image formed by the concave lens is always _______ and __________.
Match the lens type with the characteristics of the image it forms:
Match the lens type with the characteristics of the image it forms:
In the ray diagram for a convex lens, where does the ray that is drawn parallel to the principal axis pass after hitting the lens?
In the ray diagram for a convex lens, where does the ray that is drawn parallel to the principal axis pass after hitting the lens?
Describe the nature of an image formed by a concave lens.
Describe the nature of an image formed by a concave lens.
For a convex lens, if the image size is 22mm and the actual size is 7mm, then the magnification is __________.
For a convex lens, if the image size is 22mm and the actual size is 7mm, then the magnification is __________.
Flashcards
Crest
Crest
The highest point of a transverse wave.
Trough
Trough
The lowest point of a transverse wave.
Wavelength
Wavelength
The distance between two consecutive crests or troughs of a transverse wave.
Frequency
Frequency
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Wave speed
Wave speed
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Convex Lens
Convex Lens
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Concave Lens
Concave Lens
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Real Image
Real Image
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Virtual Image
Virtual Image
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Inverted Image
Inverted Image
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Diminished Image
Diminished Image
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Enlarged Image
Enlarged Image
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Focal Point
Focal Point
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Focal point (F)
Focal point (F)
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Principal axis
Principal axis
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Central ray
Central ray
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Parallel ray
Parallel ray
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Study Notes
Types of Waves
- Waves are categorized into transverse and longitudinal waves.
- Transverse waves displace the medium perpendicular to the direction of the wave.
- Longitudinal waves displace the medium parallel to the direction of the wave.
Transverse Waves
- A transverse wave has peaks (or crests) and troughs.
- Examples include water ripples, light waves, waves on a rope or slinky, and S-waves (secondary waves).
Longitudinal Waves
- A longitudinal wave is characterized by compressions and rarefactions.
- Examples include sound waves, slinky waves, and P-waves (primary waves).
Wave Properties
- Amplitude (A): The maximum displacement of a point on the medium from its undisturbed position. A higher amplitude means a louder sound.
- Frequency (f): The number of waves that pass a fixed point in one second, measured in Hertz (Hz).
- Wavelength (λ): The distance between two consecutive corresponding points on a wave, like from crest to crest or trough to trough. Wavelength in light affects color.
- Wave Speed (v): The speed at which a wave travels, calculated as wave speed = frequency × wavelength. The speed of sound in air is 330 m/s.
Wave Equation
- The relationship between wave speed, frequency, and wavelength is given by: v = fλ
- Wave speed (m/s) = Frequency (Hz) × Wavelength (m)
Examples of Wave Calculations
- A water wave with frequency 2Hz and wavelength 0.3m travels at 0.6 m/s.
- A water wave with speed 1 m/s and frequency 5Hz has a wavelength of 0.2 m.
- If Dave's ear vibrates 660 times per second (660 Hz) when hearing a sound, with sound speed of 330 m/s, the wavelength of the sound is 0.5 m.
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