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All electromagnetic (EM) waves are transverse and travel at 3 x 108 ms-1 in a vacuum. Transverse waves can be demonstrated by shaking a slinky vertically or through the waves seen on a string, when it's attached to a signal generator. 5.63 - Graphs of transverse and longitudinal waves.
Calculate the mean wavelength of the laser light and compare it with the accepted value of 635 nm. Assess the percentage uncertainty in this result.
26. A ray of light of frequency 5×1014 Hz is passed through a liquid. The wavelength of light measured inside the liquid to be 450nm. Calculate (i) wave length of light in vacuum. (ii) refractive index of liquid (iii) velocity of light in the liquid. Take velocity fo light in vacuum as 3×108-ms 1.
4 A laser produces a ray of blue light of wavelength 4.0 × 10–7m (0.000 000 40 m). (a) (i) State the speed of light in a vacuum. speed = .................................................
The speed of light in a vacuum is 2.997924 x 10 8 m/s. The speed of light in air is 2.997050 x 10 m/s. These speeds are so close that we use 3.00 x 108 m/s as the speed of light in both a vacuum and air. The symbol for the speed of light in a vacuum (or air) is "c". We will use the symbol "v" for the speed of light in any other substance
Formulas and Constants: f = c/λ E = hf. f = frequency. c = speed of light (3.0 x 108 m/s) λ = wavelength. E = energy h = Planck’s constant (6.6262 x 10-34 J•s) 1. Calculate the λ given the frequency of radiation is 5.10 x 1014 hz. 2. Calculate the frequency of red light with λ = 6.50 x 10-7m.
Core Practical 6: Determine the Wavelength of Light from a Laser or other Light Source using a Diffraction Grating.
