CP Interplanetary space contains many small particles referred to as interplanetary dust.
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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?arrow_forwardA particle of cosmic dust has a density =2.0g/cm3 , (a) Assuming the dust particles are spherical and light absorbing, and are at the same distance as Earth from the Sun, determine the particle size for which radiation pressure from sunlight is equal to the Sun's force of gravity on the dust particle, (b) Explain how the forces compare if the particle radius is smaller, (c) Explain what this implies about the sizes of dust particle likely to be present in the inner solar system compared with outside the Oort cloud.arrow_forwardQ: An AM radio signal propagating in free space has: E = Eo sin(1200πt - βz)ax H= (Eo / η)*sin(1200πt- βz)az Express these in phasor form and detrmine β and η such that the fields Satisfy Maxwell’s equations.arrow_forward
- A 1.00-m² solar panel on a satellite that keeps the panel oriented perpendicular to radiation arriving from the Sun absorbs 1.40 kJ of energy every second. The satellite is located at 1.00 AU from the Sun. (The Earth-Sun distance is approximately 1.00 AU.) How long would it take an identical panel that is also oriented perpendicular to the incoming radiation to absorb the same amount of energy, if it were on an interplanetary exploration vehicle 2.85 AU from the Sun? Sarrow_forwardA 1.00-m2 solar panel on a satellite that keeps the panel oriented perpendicular to radiation arriving from the Sun absorbs 1.40 kJ of energy every second. The satellite is located at 1.00 AU from the Sun. (The Earth-Sun distance is approximately 1.00 AU.) How long would it take an identical panel that is also oriented perpendicular to the incoming radiation to absorb the same amount of energy, if it were on an interplanetary exploration vehicle 2.05 AU from the Sun? answer in secondsarrow_forwardThe spectrum of a star is used to measure its radial velocity with respect to the Sun, the component of the star's velocity vector that is pa rallel to a vector connecting the star's centre to the centre of the Sun. The measurement relies on the Doppler effect, in which rad iation is shiftedin frequency when the source is moving towards or away from the observer. When a star emitting electromagnetic radiation of frequency v moves with a speed s relative to an observer, the observer detects radiation of f requency vreceding, = vf or vapproaching = v/f, where f = {(1 - s/c)/(1 + s/c)}1/2 and c is the speed of light. (a) Three lines in the spectrum ofatomic iron of the star HDE 271 182, which belongs to the Large Magellanic Cloud, occur at 438.882 nm, 441.000 nm, and 442.020 nm. The same lines occur at 438.392 nm, 440.510 nm, and 441.510 nm in the spectrum of an Earthbound ironarc. Determine whether HDE 271 182 is receding from or approaching the Earth and estimate the sta r's radial…arrow_forward
- A rocket zooms past the earth at v= 2.0 x 10 m/s. Scientists on the rocket have created the electric and magnetic fields shown in the figure.(Figure 1) Assume that B = 0.60 T and E= 6.0x105 V/m. Figure B E 2.0 x 10 m/s 1 of 1 What is the electric field strength measured by an earthbound scientist? Express your answer using two significant figures. 5 ΑΣΦ E = Submit Part B X Incorrect; Try Again; One attempt remaining Check your signs. O Up -6.105 What is the direction of the electric field measured by an earthbound scientis Down Submit Part C O Left O Right O Into the page O Out of the page Previous Answers Request Answer B = 0.60 T Submit ? Request Answer What is the magnetic field strength measured by an earthbound scientist? Express your answer using two significant figures. Correct Previous Answers V/marrow_forwardImagine a satellite located at a distance from the Sun of D = 151.1 × 10³ m. The satellite has a Solar Sail with a diameter of d = 1 km = 10³ m. The total mass of the satellite and sunshield is m = 100 kg. Calculate the acceleration of satellite resulting from radiation pressure of the Sun. Assume that the Solar Sail is oriented perpendicular to the Sun's rays, and that it is a perfect mirror and reflects every photon that strikes it. Give your answer in units of m/s² to at least 3 significant digits. Remember that entering scientific notation you should use (for example) 3.141592e-2 for 0.0314159. (You may also type in "0.0314159" - either should work).arrow_forwardThe ICNIRP also has guidelines for magnetic-field exposure for the general public. In the frequency range of 25 Hz to 3 kHz, this guideline states that the maximum allowed magnetic-field amplitude is 5>f T, where f is the frequency in kHz. Which is a more stringent limit on allowable electromagnetic-wave intensity in this frequency range: the electric-field guideline or the magnetic-field guideline? (a) The magnetic-field guideline, because at a given frequency the allowed magnetic field is smaller than the allowed electric field. (b) The electric-field guideline, because at a given frequency the allowed intensity calculated from the electric-field guideline is smaller. (c) It depends on the particular frequency chosen (both guidelines are frequency dependent). (d) Neither—for any given frequency, the guidelines represent the same electromagneticwave intensityarrow_forward
- 1:.0 O %).. N O a all zain 1Q O 24 May 2021 a... H.W: If a (10 mJ) laser pointer creates a spot that is 5 mm in diameter in a 30 second, determine the radiation pressure on a screen that absorbs 40% of the light that strikes it.arrow_forwardRadiation from a distant neutron star is found by a satellite far from Earth to have wavelength λ = 3 nm. a) What is the ratio δλ/λ, where δλ is the difference with respect to the measurement by a detector on the surface of the Earth? The Schwarzschild radius of the Earth is 8.7 mm, while its actual radius is 6.4 × 106 m. b) What is the ratio δ′ λ/λ, where δ′ λ is the difference with respect to the wavelength of the same radiation at the time of emission from the neutron star’s surface? Assume that the neutron star’s actual radius is three times its (typically 4 km) Schwarzschild radius.arrow_forwardA plane harmonic electromagnetic wave is propagating in space along the y axis. If the E- field is linearly polarised in the yz-plane and if lamda= 500 nm, what is an expression for the corresponding B field when the irradiance is 53.2 W/m2?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning