Consider a bright star in our night sky. Assume its distance from Earth is 86.3 light-years (ly) and its power output is 4.00 × 1028 W, about 100 times that of the Sun. One light-year is the distance traveled by light through a vacuum in one year. (a) Find the intensity of the starlight at the Earth. W/m² (b) Find the power of the starlight the Earth intercepts. (The radius of Earth is 6.38 x 106 m.) MW Need Help? Read It

Consider a bright star in our night sky. Assume its distance from Earth is 86.3 light-years (ly) and its power output is 4.00 × 1028 W, about 100 times that of the Sun. One light-year is the distance traveled by light through a vacuum in one year. (a) Find the intensity of the starlight at the Earth. W/m² (b) Find the power of the starlight the Earth intercepts. (The radius of Earth is 6.38 x 106 m.) MW Need Help? Read It

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

(a)What is the frequency and the rms strength of the electric field?(b) What is the direction of its oscillation?
If the electric field intensity in a source-free, dielectric medium is given asE = Eq[sin(ax — wr) + sin(@x + o] , V/m, determine the mag- netic field intensity using Maxwell’s equation from Faraday's law. What is the displacement current density in the medium?
An outdoor WiFi unit for a picnic area has a 100-mW output and a range of about 30.9 m. What output power would reduce its range to 10.8 m for use with the same devices as before? Assume there are no obstacles in the way and that microwaves into the ground are simply absorbed.
A 40.0 W incandescent light bulb transforms 19.0% of its energy into visible light; the rest goes largely to non-visible infrared radiation. At what distance from the bulb is the amplitude of the electric field of the visible-light wave 13.1 V/m? Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer units
What inductance must be connected to a 17 pF capacitor in an oscillator capable of generating 550 nm (i.e., visible) electromagnetic waves? Comment on your answer.
In Microwave diathermy The frequency used is .a 750MHZ .b 900MHZ .C 800MHZ .d 600MHZ
What area is needed for a solar collector to absorb 45.0 kW of power from the Sun's radiation if the collector is 75.0% efficient? (At the surface of Earth, sunlight has an average intensity of 1.00 × 10³ W/m².)
An important news announcement is transmitted by radio waves to people sitting next to their radios 100 km from the station and by sound waves to people sitting across the newsroom 3.00 m from the newscaster. Taking the speed of sound in air to be 343 m/s, who receives the news first? Explain.
An electromagnetic wave with frequency 5.70 * 10^14 Hz propagateswith a speed of 2.17 * 10^8 m/s in a certain piece of glass. Find the dielectric constant for glass at this frequency, assuming that the relative permeability is unity.
A space probe 2.0 * 10^10 m from a star measures the total intensityof electromagnetic radiation from the star to be 5.0 * 10^3 W/m2.If the star radiates uniformly in all directions, what is its total averagepower output?
A 10.0%-efficient array of solar cells collects sunlight with an average intensity of 700W/m2. (a) In order to absorb energy at a rate of 100W, what total area must the array have? (b) If the array were to pay for itself in two years, what is its maximum cost of the array, assuming it operates for 10.0 h per day, earning 9.00¢ for each kilowatt-hour collected?
Estimate the rms electric field in the sunlight that hits Mars,knowing that the Earth receives about 1350 W/m2 and thatMars is 1.52 times farther from the Sun (on average) thanis the Earth.