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- A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?Radio station WWVB, operated by the National Institute of Standards and Technology (NIST) from Fort Collins, Colorado, at a low frequency of 60 kHz, broadcasts a time synchronization signal whose range covers the entire continental US. The timing of the synchronization signal is controlled by a set of atomic clocks to an accuracy of 101012 s, and repeats every 1 minute. The signal is used for devices, such as radio-controlled watches, that automatically synchronize with it at preset local times. WWVB's long wavelength signal tends to propagate close to the ground. (a) Calculate the wavelength of the radio waves from WWVB. (b) Estimate the error that the travel time of the signal causes in synchronizing a radio controlled watch in Norfolk, Virginia, which is 1570 mi (2527 km) from Fort Collins, Colorado.ll MY MAXIS ? 11:00 PM 6% A elearning.utm.my electromagnetic radiation (EMR) and object on the earth may result in different wave interactions such as reflectance, absorption, transmission, and incident. Figure 1 shows the power acquired at the ground for some period of observation. Incident Power 6 Time (hour) Reflectance Power 5 1.5- 1- 0.5- 2 6 Time (hour) Absorption Power Time (hour) QUESTION 1: Determine the energy of each interaction. Power (W) Power (W) Power (W)
- 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 ? TA meteorologist is using radar to measure the distance to a storm. reception of the radar pulse is 0.23 ms. How far away is the storm? (in km) The time difference between transmission and OA: 3.71 | OB: 5.38 OC: 7.80 OD: 11.31 OE: 16.40 OF: 23.78 OG: 34.48 OH: 49.99ull MY MAXIS ? 11:01 PM 1% A elearning.utm.my Interaction between electromagnetic radiation (EMR) and object on the earth may result in different wave interactions such as reflectance, absorption, transmission, and incident. Figure 1 shows the power acquired at the ground for some period of observation. Incident Power Time (hour) Reflectance Power 0.5 Time (hour) Absorption Power Time (hour) QUESTION 3: State the transmission power record if the incident power is assumed the total power received. Illustration of power records is required. II Power (W) Power (W) Power (W) ल
- An FM radio station broadcasts at a frequency of 91.5 MHz. If you drive your car toward thestation at 26.1 m>s, what change in frequency do you observe?A carbon signal measured in a 300MHz spectrometer with an observing frequency of 75.47MHz is found to have a chemical shift of 137.71 ppm. What is the resonance frequency of the carbon with this chemical shift? a. 41313.00 Hz b. 300041313 Hz c. 74480393 Hz d. 10392.97 HzThe most energetic electromagnetic waves in the universe are gamma-rays from gamma ray bursts (GRBs) from collapsing massive stars, observed by satellites with expected energies of 100 TeV (1 TeV = 1012eV). 1. What is the frequency of these energetic gamma ray photons? 1 eV = 1.60 x 10-19 J. 2. What is the wavelength?
- A) Suppose a star is 4.15 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? B) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? C) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back?A certain star is 15.7 million light-years from Earth. The intensity of the light that reaches Earth from the star is 3.40 × 10-21 W/m². At what rate does the star radiate EM energy? x 1026 WCalculate the energies of the following waves (in kilojoules per mole) An FM radio wave at 96.5 MHz and an AM radio wave at 1100 kHz Enter your answers numerically separated by a comma. ΕΧΕΙ ΑΣΦΑ EPM, EAM 1.06 10-47,1.21 10-49 Submit ° Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining ▾ Part B ? kJ/mol An X ray with 3.40×10-9 m and a microwave with A=6.67×10-2 m. Enter your answers numerically separated by a comma. ΜΕ ΑΣΦ 0 ? 49 Ex-ray, Eairo 9.71 10 40,4.95 101 Submit Previous Answers Request Answer remaining kJ/mol