A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm,and pivoted about a vertical axis through the center, as shown in the figure. The center of eachvane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incidentupon it. The other vane is blackened and it absorbs all incident radiant energy. Anelectromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes.What is the torque due to radiation pressure on the vane assembly about the vertical axis? * -6.0 cm-1.0cm1.0 cm

A radiometer has two square vanes (1 cm by 1 cm), attached to a light horizontal cross arm, and…

Answered: 6.0 cm- 1.0 cm 1.0 cm

Science

Physics

6.0 cm- 1.0 cm 1.0 cm

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 73P: A linearly polarized microwave of wavelength 1.50 cm is directed along the positive x axis. The...

See similar textbooks

Similar questions

A linearly polarized microwave of wavelength 1.50 cm is directed along the positive x axis. The electric field vector has a maximum value of 175 V/m and vibrates in the xy plane. Assuming the magnetic field component of the wave can be written in the form B = Bmax sin (kx t), give values for (a) Bmax, (b) k, and (c) . (d) Determine in which plane the magnetic field vector vibrates. (e) Calculate the average value of the Poynting vector for this wave. (f) If this wave were directed at normal incidence onto a perfectly reflecting sheet, what radiation pressure would it exert? (g) What acceleration would be imparted to a 500-g sheet (perfectly reflecting and at normal incidence) with dimensions of 1.00 m 0.750 m?
How many helium atoms, each with a radius of about 31 pm, must be placed end to end to have a length equal to one wavelength of 470 nm blue light?
Two coaxial parallel disks of equal diameter 1 m are originally placed at a distance of 1 m apart. If both disks behave as black surfaces, determine the new distance between the disks such that there is a 75% reduction in radiation heat transfer rate from the original distance of 1 m.
Consider a 3-m * 3-m * 3-m cubical furnace whose top and side surfaces closely approximate black surfaces at a temperature of 1200 K. The base surface has an emissivity of « = 0.4, and is maintained at 800 K. Determine the net rate of radiation heat transfer to the base surface from the top and side surfaces.
In the figure, initially unpolarized light is sent into a system of three polarizing sheets whose polarizing directions make angles of θ1 = 55°, θ2 = 19°, and θ3 = 47° with the direction of the y axis. What percentage of the light's initial intensity is transmitted by the system?
Assume the mostly infrared radiation from a heat lamp acts like a continuous wave with wavelength 1.50 µm . If the lamp’s 200-W output is focused on a person’s shoulder, over a circular area 25.0 cm in diameter, then how long will it take to increase the temperature of the 4.00-kg shoulder by 2.00°C, assuming no other heat transfer and given that its specific heat is 3.47 × 103 J/kg. °C ?
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface?
A beam of unpolarized light of intensity 4.04E3 W/m2 passes through a series of ideal polarizing filters with their polarizing directions turned to various angles as shown in the figure. If the middle polarizer is removed, what is the light intensity at point C (in W/m2)?
A beam of light with wavelength 440 nm in air hits a thin piece of glass 10.28 microns thick (with refractive index 1.55) at an angle of 40.8 degrees to the normal. What is the path difference between the two reflections from the layers of the glass, in wavelengths? [Note to get the phase shift we multiply this number by 2π, but this is modulo 2π, i.e. any integer number of wavelengths are 2π phase shifts, equivalent to no phase shift... basically in terms of phase we only really need the non-integer part of your answer. Note also that for the phase shift we would need to add a π for the reflection off the glass-air interface.]
In the figure, a beam of unpolarized light, with intensity 40 W/m2, is sent into a system of two polarizing sheets with polarizing directions at angles θ1 = 78˚ and θ2 = 90˚ to the y axis. What is the intensity of the light transmitted by the system?
If you have completely polarized light of intensity 150 W /m2, what will its intensity be after passing through a polarizing filter with its axis at an 89.0o angle to the light’s polarization direction?
A beam of unpolarized light shines on a stack of five ideal polarizers, set up so that the angles between the polarization axes of pairs of adjacent polarizers are all equal. The intensity of the transmitted beam is reduced from the intensity of the initial beam by a factor of α=0.239. Find the angle θ between the axes of each pair of adjacent polarizers.