Gr 8 Natural Sciences Ch 4.2: Light years, light hours and light minutes
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Questions and Answers

What is a light year equal to?

  • 10 billion kilometers
  • 10 trillion kilometers (correct)
  • 100 million kilometers
  • 1 million kilometers

What is the primary reason astronomers use units based on the speed of light?

  • To make the numbers more manageable (correct)
  • To confuse nonscientists
  • To impress their colleagues
  • To show off their math skills

How many times can light travel between Cape Town and Johannesburg in one second?

  • 100 times
  • 500 times
  • 1000 times
  • 214 times (correct)

How long does it take light to travel from the Earth to the Moon?

<p>1.3 seconds (A)</p> Signup and view all the answers

What is a light hour?

<p>The distance that light travels in one hour (A)</p> Signup and view all the answers

How many times can light travel around the Earth in one second?

<p>7.5 times (D)</p> Signup and view all the answers

What is the purpose of using light minutes and light hours?

<p>To measure distances within the solar system (D)</p> Signup and view all the answers

How long does it take light to travel from the Sun to the Earth?

<p>8 minutes (A)</p> Signup and view all the answers

What is a light year?

<p>The distance light travels in one year (C)</p> Signup and view all the answers

How long does it take for light to travel from an object one light hour away?

<p>One hour (A)</p> Signup and view all the answers

What is the distance between the Earth and Proxima Centauri?

<p>40 trillion kilometers (A)</p> Signup and view all the answers

How long does it take for light to reach Earth from Proxima Centauri?

<p>Just over four years (B)</p> Signup and view all the answers

How are distances between stars generally measured?

<p>In tens, hundreds, or thousands of light years (D)</p> Signup and view all the answers

What is the main purpose of understanding units of light years?

<p>To comprehend the vast distances in the universe (C)</p> Signup and view all the answers

How long does it take for light to reach your eyes from a lamp one meter away?

<p>Three billionths of a second (C)</p> Signup and view all the answers

What reaches out even further than the solar system?

<p>The Kuiper Belt and Oort Cloud (D)</p> Signup and view all the answers

Why do astronomers use units based on the speed of light to measure vast distances?

<p>To make the numbers more manageable (A)</p> Signup and view all the answers

What is the main difference between a light hour and a light minute?

<p>A light hour is a larger distance than a light minute (B)</p> Signup and view all the answers

What is the purpose of light years when measuring distances?

<p>To measure distances between stars and galaxies (A)</p> Signup and view all the answers

What is the approximate distance of one light year?

<p>Ten trillion kilometers (A)</p> Signup and view all the answers

How do astronomers use light hours and light minutes?

<p>To measure distances within the solar system (B)</p> Signup and view all the answers

What is a characteristic of the speed of light?

<p>It is very fast (C)</p> Signup and view all the answers

Why are units based on the speed of light useful?

<p>They make large distances more manageable (C)</p> Signup and view all the answers

What can be said about light hours and light minutes?

<p>They are units of distance (D)</p> Signup and view all the answers

What is the significance of measuring distances using light travel time?

<p>It indicates how long the light from a source takes to reach us (D)</p> Signup and view all the answers

Why is the delay in seeing the light from a lamp almost imperceptible?

<p>Because light travels extremely fast (B)</p> Signup and view all the answers

What is the scale of distances between galaxies?

<p>Millions of light years (C)</p> Signup and view all the answers

What is the purpose of understanding units of light years?

<p>To understand the vast distances in the universe (B)</p> Signup and view all the answers

What is the Kuiper Belt and Oort Cloud?

<p>Regimes that extend beyond the planets in our solar system (B)</p> Signup and view all the answers

Why do astronomers use units based on the speed of light?

<p>Because it is an accurate way to measure vast distances (D)</p> Signup and view all the answers

How far away are the closest stars to our solar system?

<p>Less than ten light years (C)</p> Signup and view all the answers

What can be said about the distances between stars in our galaxy?

<p>They are generally measured in tens, hundreds, or thousands of light years (A)</p> Signup and view all the answers

What is the main benefit of using units based on the speed of light to measure vast distances?

<p>To make numbers more manageable (A)</p> Signup and view all the answers

Which of the following is an example of a comparison used to visualize the speed of light?

<p>Light takes 0.0000003 seconds to travel 100 meters (D)</p> Signup and view all the answers

What is the relationship between a light minute and a light hour?

<p>A light hour is larger than a light minute (D)</p> Signup and view all the answers

What is the primary use of light years?

<p>To measure distances between stars and galaxies (D)</p> Signup and view all the answers

Why are units based on the speed of light useful for measuring vast distances?

<p>Because they make numbers more manageable (A)</p> Signup and view all the answers

What is the approximate distance of one light year in kilometers?

<p>10 trillion kilometers (A)</p> Signup and view all the answers

Why do astronomers prefer to use light minutes and light hours instead of kilometers or meters?

<p>Because they are more meaningful for vast distances (C)</p> Signup and view all the answers

What can be said about the speed of light?

<p>It is constant and unchanging (B)</p> Signup and view all the answers

What is the primary reason why distances to celestial objects are measured in light years?

<p>Because light years provide a scale to comprehend vast distances (B)</p> Signup and view all the answers

What is the distance of light from an object that takes one hour to reach Earth?

<p>One light hour (C)</p> Signup and view all the answers

What is the approximate distance between the nearest star to our solar system and Earth?

<p>4.24 light years (D)</p> Signup and view all the answers

What is the significance of measuring distances using light travel time?

<p>It provides a scale to comprehend vast distances (B)</p> Signup and view all the answers

What is the characteristic of light that makes it suitable for measuring vast distances?

<p>It travels at an extremely fast speed (D)</p> Signup and view all the answers

What is the scale of distances between stars in our galaxy?

<p>Thousands of light years (A)</p> Signup and view all the answers

What is the significance of the Kuiper Belt and Oort Cloud?

<p>They are regions of our solar system that extend far beyond the planets (D)</p> Signup and view all the answers

What is the reason why we can see the light from a lamp almost instantly?

<p>Because light travels at an extremely fast speed (B)</p> Signup and view all the answers

What is the primary advantage of using light years to measure vast distances?

<p>It provides a more tangible sense of the scale of vast distances (D)</p> Signup and view all the answers

Which of the following is a consequence of the speed of light being finite?

<p>We can see objects as they were in the past (A)</p> Signup and view all the answers

What is the primary reason astronomers use units based on the speed of light to measure vast distances?

<p>To make the numbers more manageable (B)</p> Signup and view all the answers

What can be inferred about two celestial objects that are one light minute apart?

<p>They are relatively close together (B)</p> Signup and view all the answers

What is a key difference between a light hour and a light minute?

<p>A light hour is a larger distance, while a light minute is a shorter distance (A)</p> Signup and view all the answers

What is the significance of the speed of light in measuring vast distances?

<p>It is a constant speed, allowing for reliable calculations (B)</p> Signup and view all the answers

What is an implication of using light years to measure distances between stars?

<p>We can see the stars as they were in the past (C)</p> Signup and view all the answers

What is a consequence of the finite speed of light on our understanding of the universe?

<p>The universe appears to be expanding (B)</p> Signup and view all the answers

What is the primary reason why measuring distances in light travel time is useful in astronomy?

<p>It provides a more relatable unit of measurement (B)</p> Signup and view all the answers

What is the implication of the distance between Earth and Proxima Centauri being 4.24 light years?

<p>Light from Proxima Centauri takes over 4 years to reach Earth (B)</p> Signup and view all the answers

What is the primary distinction between the Kuiper Belt and the Oort Cloud?

<p>The Kuiper Belt is closer to the solar system, while the Oort Cloud is farther (A)</p> Signup and view all the answers

What is the significance of the speed of light in measuring distances?

<p>It is a constant that allows us to calculate distances (D)</p> Signup and view all the answers

What is the implication of the fact that light from an object one light year away takes one year to reach Earth?

<p>The distance between Earth and the object is vast (A)</p> Signup and view all the answers

What is the primary reason why astronomers use units of light years to measure distances?

<p>It is a more relatable unit of measurement (D)</p> Signup and view all the answers

What is the characteristic of the speed of light that makes it suitable for measuring vast distances?

<p>It is extremely fast (B)</p> Signup and view all the answers

What is the significance of the scale of distances between stars in our galaxy?

<p>It is a measure of the galaxy's size (A)</p> Signup and view all the answers

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