Consider a typical red laser pointer with wavelength 653 nm. What is the light's frequency in hertz? (Recall the speed of light c = 3.0 × 108 m/s)
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Consider a typical red laser pointer with wavelength 653 nm. What is the light's frequency in hertz? (Recall the
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- Consider a typical red laser pointer with wavelength 649 nm. What is the light's frequency in hertz? (Recall the speed of light c = 3.0 × 108 m/s.) f =Scientists are working on a new technique to kill cancer cells by zapping them with ultrahigh-energy (in the range of 1.00×1012 W) pulses of light that last for an extremely short time (a few nanoseconds). These short pulses scramble the interior of a cell without causing it to explode, as long pulses would do. We can model a typical such cell as a disk 5.00 μm in diameter, with the pulse lasting for 4.00 ns with an average power of 2.00×1012 W. We shall assume that the energy is spread uniformly over the faces of 100 cells for each pulse. I 1.00×1021 W/m² Submit Previous Answers Part C Correct What is the maximum value of the electric field in the pulse? ΜΕ ΑΣΦ Emax Submit Request Answer Part D ? V/m What is the maximum value of the magnetic field in the pulse? ΜΕ ΑΣΦ Bmax = Submit Request Answer ? TThe wavelength of light is 5000 A. Find the wave number. (a) 0 5x 10 (b) 3x 10° (c) 2x10 (d) 1x 10°
- A light ray is incident from air into glass (ng = 1.52) then onto water (ny = 1.33). The wavelength of light in air (na = 1) is hair = 500 nm and it travels at a speed c = 3 x 10% m/s. The wavelength of light, 2, and its frequency, f, in water, are, respectively: 376 nm,8x10*11 Hz 500 nm,6x10*14 Hz 376 nm,6x10*14 Hz 500 nm,8x10*11 HzWhat is the frequency of a light ray of wavelength 6.50 x 10^9m?A beam of light, traveling at speed 3*108 m/s, has wavelength 420 nm. What is its frequency?
- What is the speed of light traveling from air to a medium of refractive index n=1.5? (Speed of light in vacuum is 3.0 × 108 m/s) O 3.0 x 108 m/s. O 1.5 x 108 m/s. O 2.0 × 108 m/s. O 0.67 x 108 m/s. O 0.75 x 108 m/s.Q. 1. Light with an energy flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 cm², the total momentum delivered (for complete absorption) during 30 minutes is: (a) 36 x 10-5 kg m/s. (c) 108 x 104 kg m/s. (b) 36 x 104 kg m/s. (d) 1.08 x 107 kg m/s.The wavelength of red light from a helium-neon laser is 633 nm in air and 479 nm in a medium of index of refraction n. The speed v and the frequency f of light in the given medium are: (Given: c = 3 x 10^8 m/s, and 1 nm = 10^-9 m) V = 2.64 x 10^8 m/s; f = 4.74 × 10^14 Hz v = 2.45 x 10^8 m/s; f = 4.74 × 10^14 Hz v = 2.27 x 10^8 m/s; f = 6.26 × 10^14 Hz v = 2.27 x 10^8 m/s;f = 4.74×10^14 Hz v = 2.64 x 10^8 m/s; f = 5.39 x 10^14 Hz v = 2.45 x 10^8 m/s; f = 5.80 × 10^14 Hz
- Spatial distribution of electric field E(x) of a light beam which has a wavelength 5.0x107m coming from free space (n=1) and entering the dielectiric medium (n=1.5) at x=0 interface is shown below. Write an expression for the electric field E(x,t) of light inside the medium. (Ignore any reflection at the interface) E(X) λ=5.0x107m E₂ MM n=1 x=0 E(x,t)=? n=1.5 X(a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) SQ.2 Light passes through a transparent substance at a speed of 2 ×108 m/s. What is the index of refraction of the substance? Q.3 The wavelength of a monochromatic light source is measured to be 5.5 × 10-8 m in a diffraction experiment. (a) What is the frequency? (b) What is the energy of a photon of this light?
