If spectral lines from a distant galaxy are 30% longer than when the source is at rest, how fast is the galaxy receding? O a. 0.30 c O b.0.26 c O c. 2.69 c d. 0.69 c
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- The red-shift of a galaxy observed by us corresponds to a speed of 50000 km/s. How far is the galaxy from us approximately? A. 700 Mpc B. 70 Mpc C. 7 Mpc D. 7 Gpc Is the answer A? Thank you!1. axextes A particle interacts with other particles in a uniform density medium and executes a random walk. If the particle takes an average time t to travel a distance L away from its starting point, about how long on average does the particle take to travel a distance 2L away from its starting point? A. 0.5t B. t C. 1.4 t D. 2 t E. 4t24. A person in a spaceship passing Earth observes her own heart rate to be 75 beats / minute and her spaceship to be 60 m long. A person on Earth observes the spaceship person's heart rate to be 45 beats / minute and her spaceship to be long. A.36 m B. 48 m C. 60 m D. 75 m E. 100 m
- 1. Based on the problem below, if a crew member on the spaceship measures itslength to be 400 m, what is the length measured by an observer on earth? a. 34.2 mb. 44.1 mc. 56.4 md. 78.2 m 2. Based on the problem below, how far does the ship travel in relation to theearth during each pulse? a. 1.35 kmb. 4.21 kmc. 83.8 kmd. 94.5 km2. Astronaut A is moving away from Astronaut Bat half the speed of light. Astronaut A turns on and off a laser so that the beam is on for 1.00s as measured by Astronaut A. a. How fast is the light moving in the reference frame of Astronaut B? b. How much time is the beam on as measured by Astronaut B? c. The laser emits a wavelength of 635nm as seen in the reference frame of Astronaut A. What wavelength is observed in the reference frame of Astronaut B?Q1