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I tune my radio to WBEN-AM, 930kHz. What is the length of its wavelength, λ?
λ = _______________
Consider two EM waves of the same frequency. One (f1) has three times the amplitude of the other (f2). What is the ratio of the energies contained within the waves? Express your answer as a ration, i.e., 5/2, 6/1, etc.
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- What are the wavelengths of (a) X-rays of frequency 2.01017 Hz? (b) Yellow light of frequency 5.11014Hz ? (C) Gamma rays of frequency 1.01023Hz ?Assume the radiation from a heat lamp is monochromatic, with a wavelength of 1.5 μm . I =3.313 kW/m^2. a. What is the peak electric field strength, in kilovolts per meter? b. Find the peak magnetic field strength, in microtesla. c. How long, in seconds, will it take to increase the temperature of the 3.95-kg shoulder by 2.00°C, assuming that the shoulder absorbs all the radiation from the lamp and given that its specific heat is 3.47 × 103 J/(kg⋅°C)?Consider regions of the EM spectrum. In order to study the structure of a crystalline solid, you want to illuminate it with EM radiation whose wavelength is the same as the spacing of the atoms in the crystal (0.190 nm). A) What is the frequency of the EM radiation in Hertz? B) In what part of the EM spectrum (radio, visible, etc.) does it lie?
- Consider a laser beam with this averaged intensity, Savg = 885 W/m^2. [Hint: light intensity S = u c where u is the energy density.] What is the rms magnetic field in the beam? (in T) OA: 6.155x10-7 OB: 8.187x10-7 OC: OD: 1.089x10-6 1.448x10-6 OE: OF: 1.926x10-6 2.562x10-6 OG: 3.407x10-6 OH: 4.531x10-6A police officer standing at the side of the road uses a radar emitting frequency of 24.15 GHz. A car is approaching the officer at a speed of 60mph. What will be the difference in frequency of the beam reflected by the car received back by the radar? Select one: a. 2.2 kHz (higher frequency) o b. 2.2 kHz (lower frequency) c. 4.8 kHz (higher frequency) o d. 4.8 kHz (lower frequency)You are using a spectrometer which as a monochromator set at 715 nm. The P value of the irradiance of light is 0.482 and the P, value of the irradiance of light is 0.791. What is the absorbance value of this light to 3 significant figures in standard notation?
- A radio antenna 326 m in diameter receives a radio signal from a very distant object at perpendicular incidence. The radio signal is a continuous sine wave with an amplitude of Emax = 0.82x10-5 V/m. Assume that the antenna absorbs all the radiation that falls on the disk and calculate the power in Watts received by the antenna. Select one: a. 3.0e-8 b. 2.3e-8 c. 7.4e-4 d. 7.4e-9Light with a wavelength of 571 nm is in the visible part of the electromagnetic spectrum. What is the numerical value of the exponent p if 571 nm = 571 x 10² cm? p= Report your numerical answer below, assuming three significant figures.If electric and magnetic field strengths vary sinusoidally in time, being zero at t=0, then E=E0 sin 2πft and B=B0 Sin 2πft . Let f = 1.00 GHz here When do they reach their most negative value?
- A 75 mW laser produces a (polarized) beam of 595 nm light. This light reflects normally off an object that reflects 90 percent of the incident energy. How long does it take this laser to give the surface a momentum of 0.005 kgm/s If the rms electric field inside the beam is 1600 v/m, what is the radius of the beam?Calculate 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/molA 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/m