At what speed must the source be moving to change the observed frequency of yellow light from 5.16×10¹4 Hz to 3.37x10¹4 Hz.
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- A distant star is traveling directly away from Earth with a speedof 49,500 km>s. By what factor are the wavelengths in this star’sspectrum changed?(a) The distance to a star is approximately 4.94 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? years(b) How long does it take sunlight to reach Earth? minutes(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.) sYou have been hired as an expert witness for an attorney who is representing a speeding driver. The driver of the car was given a ticket for running a red light at an intersection. According to the driver, who has taken some courses in physics, when he was looking at the red light as he approached the intersection, the Doppler shift made the light of wavelength 650 nm appear to be green light of wavelength 520 nm. Therefore, according to the driver, he should not be charged with running a red light because it appeared green to him. What advice do you give the attorney?
- what is the frequency of a light of wavelength 7.4 x 10^-7 m?A beam of light, traveling at speed 3*108 m/s, has wavelength 420 nm. What is its frequency?Consider electromagnetic waves in free space. What is the wavelength of a wave that has the following frequencies? (a) 4.20 ✕ 1011 Hz m(b) 6.76 ✕ 1016 Hz m
- Consider electromagnetic waves in free space. What is the wavelength of a wave that has the following frequencies? (a) 4.24 x 10¹¹ Hz (b) m 8.28 x 10¹6 Hz mA galaxy moves away from the Earth. It is observed that light emitted by the galaxy at a wavelength of 705.2 nm is observed by astronomers at Earth at a wavelength of 736.6 nm. Determine the velocity at which the galaxy is moving away from the Earth.A spaceship is approaching a space station at a speed of 1.60 × 105 m/s. The space station has a beacon that emits green light with a frequency of 5.88 × 1014 Hz. (a) What is the frequency of the beacon observed on the spaceship? (Express your answer to five significant figures.) (b) What is the change in this frequency?
- An electromagnetic wave of frequency 4.4 x 1012 Hz propagates with speed 0.89c. Calculate the wavelength, in mm. Use two significant figures in your answer.The light from a supernova explosion is measured on a spacecraft moving towards the exploding star. Which of the following would be observed? The apparent frequency would appear to be higher than for a stationary observer. The apparent wavelength would appear to be shorter than for a stationary observer. The apparent speed of the light would be higher than for a stationary observer. a I only b II only c I and II only d I and III onlyhw 2 Laser beams are sometimes used to burn away cancerous tissue. What is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a 2.1-mm diameter spot of cancerous tissue and must deposit 515 J of energy to it in a time period of 4.05 s?