You and your friend Bruce are experimenting with a red lamp shade and blue lamp shade. You place lamp shades individually over a 120-W light bulb. Assume that the light radiates from the lamps uniformly and 7.3% of their power is converted to light. (a) What is the average intensity of the light at 1.4 m from the red (A = 710 nm) lamp shade? W/m2
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- A new cordless phone emits 4.0 mW at 5.8 GHz. The manufacturer claims that the phone has a range of 100 feet. If we assume that the wave spreads out evenly with no obstructions, what is the electric field strength at the base unit 100 feet from the phone?The amplitude of the B field of an EM wave is 2.4 x 10-7 T. The wave travels in free space Part A What is the amplitude of the E field? Express your answer to two significant figures and include the appropriate units. Eo = Submit Part B I = Value Request Answer Submit What is the average power per unit area of the EM wave? Express your answer to two significant figures and include the appropriate units. Value Units Request Answer ? Units ?A photon of ultraviolet (UV) light possesses enough energy to mutate a strand of human DNA. What is the energy of a single UV photon having a wavelength of 41 nm?
- The power radiated by the sun is 3.9 x 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 x 1011 m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.30-m² patch of flat land at the equator at point Q? Number Units Sunlight Axis of rotation Equator 23.4Under what conditions might wires in a circuit where the current flows in only one direction emit electromagnetic waves (select all that apply)? When the current is switching between being on and steady and completely off When the current as a function of time is described by the function I(t) = 2 + sin(2t) %3D When the current is steadily increasing or decreasing When the current has any nonzero constant valueIn a particular area of the country, electrical energy costs $0.18 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 3.90 hours? $
- A microwave source produces pulses of 21.0 GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius R = 8.50 cm is used to focus the microwaves into a parallel beam of radiation, as shown in the figure below. The average power during each pulse is 25.0 kW. (a) What is the wavelength of these microwaves? cm (b) What is the total energy contained in each pulse? μJ (c) Compute the average energy density inside each pulse. mJ/m³ 3 (d) Determine the amplitude of the electric field and magnetic field in these microwaves. Emax kv/m μT B. max (e) Compute the force exerted on the surface during the 1.00 ns duration of each pulse. Assume this pulsed beam strikes an absorbing surface. UNA typical laser used in introductory physics laboratories produces a continuous beam of light about 1.90 mm in diameter. The average power of such a laser is 0.930 mW. What is the peak intensity? O 434 W/m² O 775 W/m² O 558 W/m² O 868 W/m² O 656 W/m²7. a. A 60-(MHz) electromagnetic wave exists in an air-dielectric coaxial cable having an inner conductor with radius a and an outer conductor with inner radius b. Assuming perfect conductor, and the phasor form of the electric field intensity to be E = e-jkz (V/ m), ax i. find k, ii. find H from the V X E equation. and iii. find the surface current density
- In an EM wave traveling west, the B field oscillates vertically and has a frequency of 89.0 kHz and an rms strength of 6.30x10-9 T. Part A What is the frequency of the electric field? ? kHz Submit Reguest Answer Part B What is the rms strength of the electric field? Erms= V/m Submit Request AnswerCh 24, Problem 31 The power radiated by the sun is 3.9 × 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 × 1011 m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.72-m2 patch of flat land at the equator at point Q?You and your friend Bruce are experimenting with a red lamp shade and blue lamp shade. You place lamp shades individually over a 120-W light bulb. Assume that the light radiates from the lamps uniformly and 7.8% of their power is converted to light. (a) What is the average intensity of the light at 2.0 m from the red (? = 710 nm) lamp shade? ___________________ W/m2