Explanation Given: Radius of planet = 2 times radius of the earth. The orbit speed = 3 times that of earth. The power output of a star = 6.8 × 10 29 W The radius of the star = 6 times the radius of the sun. In one rotation energy received by a planet = 9 .4 × 10 22 J Formula used: Intensity, I = P a Where, P = Power a = area of the source = 4 π r 2 Power = Energy time P = E t Where, E = Energy t = Duration Calculation: Assume the energy is radiated spherically symmetrically. The surface area of star, a = 4 π r 2 Radius of the star = 6 times the radius of the sun. Radius of sun = 6 .96 × 10 8 m Radius of star, r = 6 × 6.96 × 10 8 m I = P a I = 6.8 × 10 29 W 4 π ( 6 × 6.96 × 10 8 m ) 2 I = 3.10 × 10 9 W/m 2 The energy from the star will be radiated out into space in all directions equally. The ratio of the power output by the stare to the power falling on the planet’s surface is the same as the ratio of the surface area of a sphere with a radius equal to the planet’s orbital radius to the cross-sectional area of the planet. P s t a r P r e c e i v e d = 4 π r o r b i t 2 π r p l a n e t 2 ⇒ r o r b i t 2 = r p l a n e t 2 P s t a r 4 P r e c e i v e d r o r b i t = r p l a n e t 2 P s t a r 4 P r e c e i v e d r o r b i t = r p l a n e t 2 P s t a r P r e c e i v e d Since Radius of planet = 2 times radius of the earth

Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)

4th Edition

ISBN: 9780134110684

Author: Randall D. Knight (Professor Emeritus)

Publisher: PEARSON

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Chapter 16, Problem 69EAP

To determine

The electromagnetic wave intensity at the surface.

The planet’s distance from the star.

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Chapter 16, Problem 68EAP

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Chapter 16 Solutions

Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)

Ch. 16 - Prob. 1CQ Ch. 16 - A wave pulse trath along a stretched string at a...Ch. 16 - FIGURE Q16.3 is a history graph showing the...Ch. 16 - FIGURE Q16.4 shows a snapshot graph and a history...Ch. 16 - Rank in order, from largest to smallest, the...Ch. 16 - A sound wave with wavelength ?0 and frequency...Ch. 16 - Prob. 7CQ Ch. 16 - FIGURE Q16.8 is a snapshot graph of a sinusoidal...Ch. 16 - FIGURE Q16.9 shows the wave fronts of a circular...Ch. 16 - Prob. 10CQ

Ch. 16 - One physics professor talking produces a sound...Ch. 16 - You are standing at x = 0 m, listening to a sound...Ch. 16 - The wave speed on a string under tension is 200...Ch. 16 - The wave speed on a string is 150 m/s when the...Ch. 16 - A 25 g string is under 20 N of tension. A pulse...Ch. 16 - Draw the history graph D(x = 4.0 m, t ) at x = 4.0...Ch. 16 - Prob. 5EAP Ch. 16 - Draw the snapshot graph D (x, t = 0 s) at t = 0 s...Ch. 16 - Prob. 7EAP Ch. 16 - Prob. 8EAP Ch. 16 - Prob. 9EAP Ch. 16 - A wave has angular frequency 30 rad/s and...Ch. 16 - A wave travels with speed 200 m/s. Its wave number...Ch. 16 - Prob. 12EAP Ch. 16 - The displacement of a wave traveling in thee...Ch. 16 - What are the amplitude, frequency and wavelength...Ch. 16 - 15. Show that the displacement D(x, t) cx2 + dt2,...Ch. 16 - Show that the displacement D(x, t) = ln(ax + bt),...Ch. 16 - a. What is the wavelength of a 2.0 MHz ultrasound...Ch. 16 - Prob. 18EAP Ch. 16 - Prob. 19EAP Ch. 16 - Prob. 20EAP Ch. 16 - Prob. 21EAP Ch. 16 - Prob. 22EAP Ch. 16 - 23. Cell phone conversations are transmitted by...Ch. 16 - a. How long does it take light to travel through a...Ch. 16 - A light wave has a 670 nm wavelength in air. Its...Ch. 16 - Prob. 26EAP Ch. 16 - Prob. 27EAP Ch. 16 - Prob. 28EAP Ch. 16 - Prob. 29EAP Ch. 16 - Prob. 30EAP Ch. 16 - Prob. 31EAP Ch. 16 - Prob. 32EAP Ch. 16 - A sound wave with intensity 2.0 × l0-3 W/m2 is...Ch. 16 - Prob. 34EAP Ch. 16 - Prob. 35EAP Ch. 16 - During takeoff, the sound intensity level of a jet...Ch. 16 - 37. The sun emits electromagnetic waves with a...Ch. 16 - What are the sound intensity levels for sound...Ch. 16 - Prob. 39EAP Ch. 16 - Prob. 40EAP Ch. 16 - Prob. 41EAP Ch. 16 - Prob. 42EAP Ch. 16 - A bat locates insects by emitting ultrasonic...Ch. 16 - Prob. 44EAP Ch. 16 - 45. I FIGURE P16.45 is a history graph at x = 0 m...Ch. 16 - . I FIGURE P16.46 is a snapshot graph at t=0sof a...Ch. 16 - Prob. 47EAP Ch. 16 - Prob. 48EAP Ch. 16 - Prob. 49EAP Ch. 16 - A helium-neon laser beam has a wavelength in air...Ch. 16 - Earthquakes are essentially sound waves—called...Ch. 16 - Helium (density 0.18k/m ’ at 0C and 1 atm...Ch. 16 - Prob. 53EAP Ch. 16 - 54. A sound wave is described by ,where y is in m...Ch. 16 - A wave on a string is described by...Ch. 16 - Prob. 56EAP Ch. 16 - Prob. 57EAP Ch. 16 - Prob. 58EAP Ch. 16 - Prob. 59EAP Ch. 16 - The string in FIGURE P16.60 has linear density ....Ch. 16 - A string that is under 50.0N of tension has linear...Ch. 16 - Prob. 62EAP Ch. 16 - A sinusoidal wave travels along a stretched...Ch. 16 - Prob. 64EAP Ch. 16 - Prob. 65EAP Ch. 16 - An AM radio station broadcasts with a power of...Ch. 16 - Prob. 67EAP Ch. 16 - The sound intensity 50m from a wailing tornado...Ch. 16 - Prob. 69EAP Ch. 16 - 70. A compact sound source radiates of sound...Ch. 16 - Prob. 71EAP Ch. 16 - Prob. 72EAP Ch. 16 - Prob. 73EAP Ch. 16 - Prob. 74EAP Ch. 16 - Prob. 75EAP Ch. 16 - Prob. 76EAP Ch. 16 - Prob. 77EAP Ch. 16 - A starship approaches its home planet at a speed...Ch. 16 - Prob. 79EAP Ch. 16 - Prob. 80EAP Ch. 16 - Prob. 81EAP Ch. 16 - A roof mass m and length L hangs from a ceiling....Ch. 16 - A communications truck with a 44-cm-diameter dish...Ch. 16 - Prob. 84EAP Ch. 16 - A water wave is a shallow-water wave if the water...

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The electromagnetic wave intensity at the surface. The planet’s distance from the star.