The metal walls of a microwave oven form a cavity of dimensions 37 cm × 37 cm × 20 cm. When 2.45-GHz microwaves are continuously introduced into this cavity, reflection of incident waves from the walls set up standing waves with nodes at the walls. Along the 37-cm dimension of the oven, how many nodes exist (excluding the nodes at the wall) and what is the distance between adjacent nodes? [Because no heating occurs at these nodes, most microwaves rotate food while operating.]
Want to see the full answer?
Check out a sample textbook solutionChapter 31 Solutions
Physics For Scientists & Engineers With Modern Physics, Volumes 2 & 3 (4th Edition)
Additional Science Textbook Solutions
University Physics Volume 2
Conceptual Physics (12th Edition)
Essential University Physics: Volume 2 (3rd Edition)
Sears And Zemansky's University Physics With Modern Physics
College Physics
Applied Physics (11th Edition)
- 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?arrow_forwardA 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.]arrow_forwardTwo radio antennas are separated by 1.60 m. Both broadcast identical 750 MHz waves. If you walk around the antennas in a circle of radius 10.0 m, how many maxima will you detect?arrow_forward
- What is the intensity fraction of a 500nm light that is incident on a double slit? Given that the slits have a width of 3µm, a slit seperation of 5µm, and an angle of 20 degrees.arrow_forwardAt a temperature of 20.0o two speakers are sending sound waves of frequency 512 Hz and 2048 Hz respectively toward a door opening of width 90.0 cm. Which wave frequency experiences a greater diffraction angle upon passing through the opening? Group of answer choices a.the 512 Hz b.the 2048 Hz c.both about the samearrow_forwardA Doppler weather radar station broadcasts a pulse of radio waves at frequency 2.85 GHz. From a relatively small batch of raindrops at bearing 38.6 east of north, the station receives a reflected pulse after 180 s with a frequency shifted upward by 254 Hz. From a similar batch of raindrops at bearing 39.6 east of north, the station receives a reflected pulse after the same time delay, with a frequency shifted downward by 254 Hz. These pulses have the highest and lowest frequencies the station receives, (a) Calculate the radial velocity components of both batches of raindrops. (b) Assume that these raindrops are swirling in a uniformly rotating vortex. Find the angular speed of their rotation.arrow_forward
- 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?arrow_forwardTwo radio antennas separated by d = 3.00 102 cm. as shown in Figure P24.7, simultaneously broadcast identical signals at the same the signals. (a) If the car is at the position of the second maximum wavelength. A car travels due north along a straight line at position x = 1.00 103 m from the center point between the antennas and its radio receives the signal. (a) If the car is at the position of the second maximum after that at point O when it has traveled a distance of y = 4.00 102 m northward, what is the wavelength of the signals? (b) How much farther must the car travel from thus position to encounter the next minimum in reception? Hint: Do not use the small-angle approximation in this problem.arrow_forwardHow can I calculate the phase difference, in radians, between the rays from the two slits as they strike the screen at the specified distance from the central maximum, given an electromagnetic radiation of intensity I0 = 340 W/m2 that passes through two parallel narrow slits that are d = 1.4 μm apart and strikes a screen located L = 2.2 m from the slits. The intensity of the radiation on the screen at y = 3.9 mm from the central interference maximum is I = 95 W/m2. I know the equation is 2 acos (I/I0)1/2 but can't figure out the answer.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning