Tag: units of mass

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

One angstrom is equal to _________ .

  1. <span>$\displaystyle { 10 }^{ -12 }m$</span>

  2. <span>$\displaystyle { 10 }^{ -10 }m$</span>

  3. the time taken by Neil Armstrong to reach the moon

  4. the distance travelled by Neil Armstrong on the surface of the moon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Angstrom is a very small unit of distance.
$1 \ angstrom = 10^{-10} \ m$
Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

Par sec is a unit of:

  1. angle

  2. velocity

  3. time

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

The parsec is a unit of length used to measure the large distances to astronomical objects outside the Solar System. One parsec is approximately equal to 31 trillion kilometres or about 3.26 light-years. One parsec is the distance to an object whose parallax angle is one arcsecond.

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

1 light year is equal to 

  1. $\displaystyle 6.3\times { 10 }^{ 5 }\overset { o }{ A } $

  2. $\displaystyle 6.3\times { 10 }^{ 4 }$$AU$

  3. $\displaystyle 3.0\times { 10 }^{ 16 }{ ms }^{ -1 }$

  4. $\displaystyle 6.3\times { 10 }^{ 4 }\overset { o }{ A } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
We know that   $1 \ light year  = 9.46\times 10^{15} \ m$
Also,   $1 \ AU = 1.5\times 10^{11} \ m$
Thus   $1 \ light year  = \dfrac{9.46\times 10^{15}}{1.5\times 10^{11}}  \ AU= 6.3\times 10^4 \ AU$
Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

1 light year is equal to

  1. $\displaystyle 9.46\times { 10 }^{ -15 }m$

  2. $\displaystyle 9.46\times { 10 }^{ 15 }m$

  3. $\displaystyle 9.46\times { 10 }^{ -13 }m$

  4. $\displaystyle 9.46\times { 10 }^{ 13 }m$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
One light-year is defined as the distance traveled by light in a vacuum in one year.

Number of seconds in 1 year is:
$1 year=365\times24\times\times60\times60\\=3.15\times10^7\ sec$

So,
$1 \ light \ year =3\times10^8\times3.15\times10^7\\= 9.46\times 10^{15} \ m$