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Questions and Answers
A red laser pointer emits light with a wavelength of 650 nanometers. What is the frequency of this light?
A red laser pointer emits light with a wavelength of 650 nanometers. What is the frequency of this light?
- 4.62 x 10^8 Hz
- 3.00 x 10^8 Hz
- 4.62 x 10^14 Hz (correct)
- 1.89 x 10^15 Hz
Which of the following is NOT a characteristic property of electromagnetic radiation?
Which of the following is NOT a characteristic property of electromagnetic radiation?
- It travels at the speed of sound in air. (correct)
- It can be reflected.
- It can be diffracted.
- It can be refracted.
A photon of light has a wavelength of 500 nanometers. What is its energy?
A photon of light has a wavelength of 500 nanometers. What is its energy?
- 3.98 x 10^-19 J (correct)
- 1.24 x 10^-6 J
- 2.48 x 10^-19 J
- 6.63 x 10^-34 J
How does the energy of a photon change as its frequency increases?
How does the energy of a photon change as its frequency increases?
What does the photoelectric effect demonstrate about the nature of light?
What does the photoelectric effect demonstrate about the nature of light?
Flashcards
Wavelength
Wavelength
The distance between two consecutive peaks of a wave.
Frequency
Frequency
The number of waves that pass a point in one second.
Electromagnetic Spectrum
Electromagnetic Spectrum
The range of all types of EM radiation, including visible light.
Photoelectric Effect
Photoelectric Effect
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Atomic Emission Spectra
Atomic Emission Spectra
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Study Notes
Electromagnetic Wave Properties
- Wavelength (λ): The distance between two consecutive crests or troughs of a wave. Measured in meters (m), nanometers (nm), or angstroms (Å).
- Frequency (ν): The number of waves that pass a point per second. Measured in Hertz (Hz).
- Speed (c): The speed at which electromagnetic waves travel in a vacuum. A constant value of approximately 3 x 10⁸ m/s.
- Amplitude: The maximum displacement of a wave from its undisturbed position. Related to intensity.
- Diffraction: Bending of waves around obstacles or through openings. More pronounced for waves with longer wavelengths.
- Interference: The superposition of two or more waves, resulting in either constructive or destructive interference.
Wave-Particle Duality
- Photon Energy (E): Energy of a photon is directly proportional to its frequency. Expressed by the equation: E = hν, where 'h' is Planck's constant.
Fundamental Equations
- Relationship between frequency and wavelength: c = λν (speed of light equals wavelength times frequency)
- Energy of a photon: E = hν (Energy equals Planck's constant times frequency)
Electromagnetic Spectrum Ranking
- Frequency (High to Low): Gamma rays, X-rays, Ultraviolet (UV) light, Visible light, Infrared (IR) light, Microwaves, Radio waves.
- Energy (High to Low): Gamma rays, X-rays, Ultraviolet (UV) light, Visible light, Infrared (IR) light, Microwaves, Radio waves
- Wavelength (Long to Short): Radio waves, Microwaves, Infrared (IR) light, Visible light, Ultraviolet (UV) light, X-rays, Gamma rays.
- Visible Light Colors (High to Low Frequency): Violet, Indigo, Blue, Green, Yellow, Orange, Red
Particle Properties
- Photoelectric Effect: The emission of electrons from a material when light shines on it. The energy of the light must exceed a threshold value, determined by the material and relating to the electron's binding energy.
Atomic Spectra
- Atomic Emission Spectra: Each element emits light at specific wavelengths when excited, producing unique patterns for each element.
- Atomic Absorption Spectra: Conversely, each element absorbs light at specific wavelengths, creating a unique pattern that, when compared against an emission spectrum, can be used to identify an element.
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