1. True or false? Even though no object with mass, and no information, can trave
ID: 293618 • Letter: 1
Question
1. True or false? Even though no object with mass, and no information, can travel faster than the speed of light, in principle an astronaut could reach a star that is 500 light years away within the current average human life span.
2. According to the theory of special relativity, two electrons moving at close to the speed of light in opposite directions, that collide head-on, meet with a relative speed of:
a. almost twice the speed of light.
b. exactly the speed of light.
c. almost the speed of light.
d. much less than the speed of light but still super fast man!
3. In the SETI project, we search for evidence that intelligent civilizations exist elsewhere. Which of the following comes closest to most of the activities that researchers in the SETI project do?
a. They send signals, sit back, relax, and wait for a message back.
b. They search for non-naturally occurring radio waves towards other stars.
c. They investigate UFO sightings on Earth.
d. They raise money to go back to the Moon.
4. The "water hole" in SETI would fall in which wavelength or color range?
a. Visible light
b. Between about 1 and 2 m wavelength.
c. Between 18 and 21 cm wavelength.
a. In the Infrared wavelength regime.
5. In the Doppler method for detecting extra-solar planets, we measure:
a. The motion of the planet by measuring the changes in velocity of the planet over time.
b. The motion of the star by measuring the changes in velocity of the star over time.
c. The change in brightness of the star over time.
d. The light coming from the planet, by blocking out the star's light.
Explanation / Answer
Ans 1) True
An astronaut can travel 500 light years wiin the human life span.
This happens because of time dialation, which helps the astronaut to travel thousands of light years. Time dialation would increase the life span of the astronaut to thousands of earth years.
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