101 حقيقة في الفيزياء

Wave Phenomena



42- Sound waves are longitudinal and mechanical.
43- Light slows down, bends toward the normal and has a shorter wavelength when it enters a higher (n) value medium.
44- All angles in wave theory problems are measured to the normal.
45- Blue light has more energy. A shorter wavelength and a higher frequency than red light (remember- ROYGBIV).
46- The electromagnetic spectrum (radio, infrared, visible. Ultraviolet x-ray and gamma) are listed lowest energy to highest.
47- A prism produces a rainbow from white light by dispersion (red bends the least because it slows the least).
48- Light wave are transverse (they can be polarized).
49- The speed of all types of electromagnetic waves is 3.0 x 108 m/sec in a vacuum.
50- The amplitude of a sound wave determines its energy.
51- Constructive interference occurs when two waves are zero (0) degrees out of phase or a whole number of wavelengths (360 degrees.) out of phase.
52- At the critical angle a wave will be refracted to 90 degrees.
53- According to the Doppler effect a wave source moving toward you will generate waves with a shorter wavelength and higher frequency.
54- Double slit diffraction works because of diffraction and interference.
55- Single slit diffraction produces a much wider central maximum than double slit.
56- Diffuse reflection occurs from dull surfaces while regular reflection occurs from mirror type surfaces.
57- As the frequency of a wave increases its energy increases and its wavelength decreases.
58- Transverse wave particles vibrate back and forth perpendicular to the wave direction.
59- Wave behavior is proven by diffraction, interference and the polarization of light.
60- Shorter waves with higher frequencies have shorter periods.
61- Radiowaves are electromagnetic and travel at the speed of light (c).
62- Monochromatic light has one frequency.
63- Coherent light waves are all in phase.

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