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13 Cards in this Set
- Front
- Back
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What is light? |
Visible light is a kind of electromagnetic waves(EM waves) |
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Young's double slit experiment |
In a Young's double slit experiment, the fringe separation is larger if 1. The wavelength is longer 2. The slit separation is smaller 3. The distance between the source and screen(slit-screen separation) is larger |
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Plane transmission grating |
In a grating experiment, the diffracted rays are separated farther apart if 1. The wavelength is longer 2. The slit separation(grating spacing) is narrower |
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Properties of EM waves |
1. The energy carried by them increases with frequency 2.Unlike mechanical waves, they can travel through a vacuum. All have the same speed of 3x10^8 ms^-1 in a vacuum 3.In other media, their speed may vary with frequency |
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Detecting sound |
Use a microphone and a cathode ray oscilloscope to detect sound waves |
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Pitch |
Pitch is a subjective quantity for describing musical notes Refering to the frequency of the wave |
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Loudness |
Loudness is a subjective quantity for describing how loud a sound is Refering to the amplitude of the wave |
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Quality |
Quality is another subjective quantity for describing musical notes. |
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Comparison between the speed of light and sound |
Light travel speed: 1.Fastest in vacuum 2.Fast in gas(air) 3.Medium in liquid(water) 4.Slowest in solid(glass) Sound travel speed: 1.Fastest in solid(glass) 2.Medium in liquid(water) 3.Slowest in gas(air) 4.Cannot travel in a vacuum |
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Comparison of wavelength between light and sound |
Light have a wavelength much shorter than the sound in air. |
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Wave nature of light and sound |
Light: 1.Electromagnetic wave(EM wave) 2.Transverse wave Sound: 1.Mechanical wave 2.Longitudinal wave |
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Relationship between frequency and wavelength |
Frequency increases means wavelength decreases |
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Relationship between frequency and pitch, loudness and amplitude |
Frequency increase---> wavelength decrease---> pitch increase Loudness increase---> Amplitude increase |
