4. A light source is emitted from the surface of a neutron star with a frequency of 600 THz. What will be the observed frequency 10 km above the surface? The acceleration due to gravity on the neutron star's surface is g = 1012 m/s².
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- 9. A radio station is broadcasting radio signals with a frequency of 1.023 x 108Hz. It travels through air at a speed of 2.997 x 108 m/s. Solve for the length of these radio waves.The 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?4. Gamma-ray busters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 4.0 x 1022 Hz. What is the wavelength of these gamma rays?
- A solar flare occurs in the surface of the sun on Monday morning at 11:45 AM. The sun is 1.496 x 108 kilometers away and light travels at 300 000 km per second. A. How long thereafter will the light beam reach the earth? B. What time of the day will the beam of light reach occurred at 11:45? C. If the solar flare re occurred at 1:30 pm when will the light from the flare reach earth?20. What would the speed of an observer be if a red (4.688 x 1014 Hz) traffic light appeared green (5.555 × 1014 Hz) to the observer? A) 4.445 x 10$ m/s B) 2.219 × 10$ m/s C) 8.438 × 107 m/s D) 5.548 x 107 m/s E) 2.890 × 10 m/s Ans: D3. An electromagnetic wave has a frequency of o = 3 x 1012 sec!. What is the wave number k in the expression sin(kz-ot)? What is the wavelength of this wave?
- The "red shift" of radiation from a distant galaxy consists of the light Hy, known to have a wavelength of 434nm when observed in the laboratory, appearing to have a wavelength of 462nm. a. What is the speed of the galaxy in the line of sight relative to the Earth? b. Is the galaxy approaching or receding?What can result from exposing the human body to frequencies between 5Hz to 8HzA) 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?
- 6.a. A light wave has a wavelength of 1,310 nm. What's the frequency of this wave?A. 229 THzB. 914 THzC. 371 THzD. 436 THz 6.b. A light wave has a frequency of 358 THz. What's the wavelength of this wave?A. 917 nmB. 556 nmC. 838 nmD. 1,018 nm. Many galaxies have supermassive black holes at their centers. As material swirls around such a black hole, it is heated, becomes ionized, and generates strong magnetic fields. The resulting magnetic forces steer some of the material into high-speed jets that blast out of the galaxy and into intergalactic space. The light we observe from the jet in Fig. has a frequency of 6.66x10^14 Hz (in the far ultraviolet region of the electromagnetic spectrum), but in the reference frame of the jet material, the light has a frequency of 5.55x10^13 Hz (in the infrared). What is the speed of the jet material with respect to us?3. The output intensity of a normal radiographic imaging system is 0.05 mGy/mAs at 100 cm. What is the output intensity of such a system at 200 cm?