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- What is the necessary condition on the path length difference between two waves that interfere (a) constructively and (b) destructively?a.) An ambulance moving away from you toward cliff ant 12 m/s emits sound a running velocity at fieauency 1000Hz. Yau are toward the clif freqvenuy with of a Z mls, what you ambulunce? Speed of do hear coming directly from 34 0mls. the sound is aj97z b,)৭27 C.)1034 d.71043 b.) What reflected freauency do you herr cliff? hear for saind from the b.) 1043 i.)972 d.) az7Which of the following statement/s is/are plausible for a wave propagating in vacuum based on the Maxwell's equations? I. A purely electric wave with an electric field but no magnetic field. II. A purely magnetic wave with a magnetic field but no electric field. III. An electromagnetic wave with both electric and magnetic fields. O A. Tonly O B. Il only O C. III only O D. I, II, and III
- The distant galaxy called Cygnus A is one of the strongestsources of radio waves reaching Earth. The distance of thisgalaxy from Earth is 3 × 1024 m. How long (in years) doesit take a radio wave of wavelength 10 m to reach Earth?What is the frequency of this radio wave?A light wave is an electromagnetic wave. This means that Select one: a. a medium is required in order for light waves to transport energy. Ob. particles of the medium regularly and repeatedly vibrate around their resting position. O c. light waves transports its energy even without medium d. particles of the medium move perpendicular to the direction of energy transport.2). ESPN radio, FM 101.1 (101.1 x 106 Hz) touts itself as the 100 kW "blowtorch" of sports radio. What is the average intensity of its signal a distance of 32,187 meters (20 miles) From its broadcasting antenna? What is the rms E field at that distance?
- An electromagnetic wvae is: 1.all light that is not visible to the human eye. 2.a two-dimensional wave that does not need a medium to travel. 3.a vit of radiation that coul causer health problems. 4.a sonar wave that travels at about the speed of light.Which part of the D.C motor is used to change the direction of current after a half cycle? a. Carbon brushes O b. Loop or coil O c. Slip rings O d. Split rings0000 О A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: A. 21 B. I C. 1/4 O D. 1/2 OE. I/16
- Visible light. The range of visible light extends from 400 nm to 700 nm. What is the range of visible frequencies of light? Give a maximum and minimum answer.he wavelength of a wave at 1 kHz in air where the speed of sound is 340 m/s is Question 3 options: 0.0000034 m. 0.34 m. 340,000,000 m. 0.00000034 m. 0.00034 m.1. Light having a certain frequency, wavelength, and speed is traveling through empty space. If the frequency of this light| were doubled, then A. its wavelength would remain the same, but its speed would double. B. its wavelength would remain the same, but its speed would be halved. C. its wavelength would be halved, but its speed would double. D. its wavelength would be halved, but its speed would remain the same. E. both its speed and its wavelength would be doubled.
