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- Radio waves transmitted through space at 3.00108m/s by the Voyager spacecraft have a wavelength of 0.120 m. What is their frequency?Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How far away is the planet Venus if the echo time is 1000 s? (b) What is the echo time for a car 75.0 m from a Highway Police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?4. An electromagnetic wave has a frequency of 4.40 x 1014 Hz. Which of these expressions would yield the wavelength of this wave in meters? a. 4.40 x 1014 divided by 3.00 x 108 b. 4.40 x 1014 x 3.00 x 108 c. 3.00 x 108 d. 3.00 x 108 divided by 4.40 x 1014 e. 4.40 x 1014 m
- 6.a. A light wave has a wavelength of 1,310 nm. What's the frequency of this wave?A. 229 THzB. 914 THzC. 371 THzD. 436 THz 6.b. A light wave has a frequency of 358 THz. What's the wavelength of this wave?A. 917 nmB. 556 nmC. 838 nmD. 1,018 nmLight has a frequency of 7.21 × 1013 hertz. What is its wavelength? The speed of light is 3.00 × 108 m/s. a. 2.40 × 10−4 nm b. 2.40 × 105 nm c. 2.16 × 109 nm d. 4.16 × 103 nm e. 4.16 × 10−6 nmA space probe emits a radio signal toward Earth at regular time intervals. One such pulse arrives on Earth 2.92 s after it is emitted from the probe. Calculate the approximate distance from the Earth to the probe. a. 3.50 × 108 m b. 7.40 × 108 m c. 6.94 × 108 m d. 8.76 × 108 m e. 4.12 × 108 m
- cál Sci What is the frequency of a radio wave with a wavelength of 6.00 x 10 m? O A. 5.00 x 10° Hz O B. 2.00 x 10° Hz O C. 1.80 x 10' Hz O D. 1.80 x 10° HzRadio station WTSR broadcasts radio waves have frequency 91.3 MHz (91.3 × 106 Hz). Whatis the wavelength of the radio wave?A. 3.29 mB. 0.0030 mC. 0.30 mD. 329 m12.10. We will learn in Chapter 14 that brightness of light called its intensity I is inversely proportional to the square of the distance r² from the light source. a. As r increases what happens to r² (does it increase or decrease)? What then happens to I (does it increase or decrease)? b. Write an equation that relates the two variables I, r² using an unknown constant k. c. The intensity from a light source is 50 Watts/meter2 when observed from 2 meters away. What is the value and units of the proportionality constant. What is the equation that relates the two variables I, r² using an unknown constant k. d. What intensity do you expect to measure at 10 meters away?
- If the frequency of an electromagnetic wave is reduced to one third, what happens to the wavelength? A. It decreases by a factor of 9. B. It is also reduced to one third. C. It increases by a factor of 6. D. It triples.Interference of light is an evidence that: A. Light is a longitudinal wave. B. Light is a wave phenomenon. C. The speed of light is very large. D. Light is electromagnetic in character. E. Light does not obey conservation of energy.Which of the following statements is false? a. Electromagnetic waves are transverse waves with alternating magnetic fields. b. Electromagnetic waves can sometimes behave as waves or as particles (photons). c. Electromagnetic waves can travel through a solid, liquid, gas, and a vacuum. d. Electromagnetic waves are made by vibrating electric charges that can travel through space where there is no matter.