QUESTION 24 The speed of light on a particular form of plastic fiber is 2.90 x 10^8 m/s. A lightwave with 1,340 nm wavelength is sent down the fiber. What frequency would that be? O.2.10 x 10-11 Hz O.2.10 x 10^14 Hz O 2.16 x 10^11 Hz O. 2.16×10114 Hz
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- 4. An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is 1.20 × 10° w/m2. What is the rms value of the electric field in the electromagnetic wave emitted by the laser? N/C f19 o0VHF, or very high frequency, refers to radio frequency electromagnetic waves in the range 30 to 300 MHz. In the U.S., television stations broadcast channels 2 through 13 in the VHF range between 54.0 MHz and 216 MHz, with ranges 72.0 to 76.0 MHz and 88.0 to 174 MHz not utilized for TV broadcasting. Each channel has a frequency width of 6.00 MHz. The table below gives the lower and upper frequency of each channel. Channel Lower edge (MHz) Upper edge (MHz) 2 54 60 3 60 66 4 66 72 5 76 82 6 82 82 88 7 174 180 8 180 186 9 186 192 10 192 198 11 198 204 12 204 210 13 210 216 (a) Calculate the broadcast wavelength range for channel 2. (Enter your answers from smallest to largest, in m.) smallest value m largest value m (b) Calculate the broadcast wavelength range for channel 4. (Enter your answers from smallest to largest, in m.) smallest value largest value m m (c) Calculate the broadcast wavelength range for channel 6. (Enter your answers from smallest to largest, in m.) smallest value…A 25-W incandescent light bulb radiates uniformly in all directions. (a) Calculate the average intensity 2.1 m from the bulb. lavg @ 2.1 m = W/m² (b) What is the average intensity 4.5 m from the bulb? lavg @ 4.5 m = W/m²
- Determine which part of the electromagnetic spectrum each of the following waves lies in. Part (a) Waves with a frequency f = 10.0 kHz. Visible UV Radio IR X-ray Microwave Part (b) Waves where λ = 650 nm. Radio Microwave Visible X-ray IR UV Part (c) Waves with a frequency f = 1.25 × 109 Hz. UV X-ray Microwave Visible Radio IR Part (d) Waves with a wavelength of λ = 0.30 nm. IR Visible X-ray Microwave UV RadioA sinusoidal electromagnetic wave has a peak electric field of 8.00 kV/m What is the intensity of the wave? a. 21 kW/m2 b. 11 kW/m2 c. 170 kW/m2 d. 85 kW/m2A positively-charged object with a mass of 0.113 kg oscillates at the end of a spring, generating ELF (extremely low frequency) radio waves that have a wavelength of 3.51 × 107 m. The frequency of these radio waves is the same as the frequency at which the object oscillates. What is the spring constant of the spring? Number i Units ↔
- Suppose a radio wave has a wavelength of 2.00 meters. What it the frequency of the radiation? It may be helpful to recall that v = AF for electromagnetic waves, while v = c = 3.00 × 108 m/s. Ο Α. 150 khz О В. 1.50 Mhz О С. 15.0 Мhz O D. 150 Mh14A spacecraft is traveling at almost the speed of light towards Alpha Proxima, the closest star outside of our solar system. A spectrometer focused on that star is looking at the wavelengths of light it gives off. Compared to the color observed from Earth, what would you expect to see from the speeding craft? a The color of light would stay the same. b The light would shift more to white. c The light would shift more to blue. d The light would shift more to red.
- Three electromagnetic waves travel through a point P along the x axis. They are polarized parallel to the y axis, with the following variations in their amplitudes. What is the phase angle of their resultant at P? E1 E2 E3 = = = (10 µV/m) sin([2.0 × 1014 rad/s] t) (5.0 μV/m) sin([2.0 × 10¹4 rad/s] t + 45°) (5.0 μV/m) sin([2.0 × 1014 rad/s] t - 45°) ○ 15° ○ 30° ○ 90° ○ 45° ○ 0°16. Light has a frequency of 5.45 1014 hertz [Note: Hz is also s-1]. What is its wavelength? Use the speed of light = 3.00 108 m/s. a. 1.82 106 nm b. 1.82 10-3 nm c. 1.82 105 nm d. 5.50 10-7 nm e. 550 nmDetermine the range of wavelengths in the microwave radiation band. O 1> 0.3 m 0.3 m > i > 3 × 10-4 m O 3 x 10-4 m > i > 7.5 x 10-7 m O 7.5 x 10-7 m > à > 4 x 10-7 O 4 x 10-7 m > i > 3 x 10-10 m O 1x 10-8 m > i > 1 x 10-11 m O a <1x 10-11 m