Tag: measuring distance of celestial bodies

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Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

1 light year $=$ ....................... m.

  1. $ 9.46 \times 10^{12}$

  2. <span>$ 9.46 \times 10^{15}$</span>

  3. <span>$ 9.46 \times 10^{10}$</span>

  4. <span>$ 9.46 \times 10^{18}$</span>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

One light year is defined as the distance travelled by light in vacuum in one year.


Speed of light in vacuum  $v = 3\times 10^{8} \ m/s$

Time in one year   $1 \ year = 365\times 24\times 60\times 60 \ s$

Thus, one light year $ = vt = 9.46\times 10^{15} \ m$

Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

The maximum distance that a light signal could have travelled since the birth of universe is called.

  1. Horizon distance

  2. Linear distance

  3. World line

  4. Hawking distance
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The horizon distance is the maximum distance from which light could have reached an observer since the beginning of the universe, given the age of the universe and the speed of light.

Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

Express parsec in terms of metres. 

  1. <span>$3.1\times { 10 }^{ 16 }m$</span>

  2. <span>$3\times { 10 }^{ 8 }m$</span>

  3. <span>$3.1\times { 10 }^{ 18 }m$</span>

  4. <span>$3.1\times { 10 }^{ 32 }m$</span>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A parsec is defined as approximately 3.086 x 10^16 meters. 3.1 x 10^16 is the standard approximation.

Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

In which of the following lists are the units an order from LONGEST to SHORTEST?

  1. light-year, kilometer, astronomical unit

  2. astronomical unit, kilometer, light-year

  3. kilometer, light-year, astronomical unit

  4. light-year, astronomical unit, kilometer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$1$ Light year $=9.461\times 10^{15}\,m$


$1$ Astronomical unit $=1.496\times 10^{11}\,m$

$1$ kilometer $=1000\,m$

Socorrect answer is option (D).