The meter is defined as the distance travelled by light in 1 299 , 792 , 458 second. Why didn't people choose some easier number such as 1 300 , 000 , 000 second? Why not 1 second?

The speed of light in vacuum is 299 , 792 , 458 m s - 1 and one meter is defined as the distance travelled by light in a vacuum. As we know that, s = v t ⇒ s = 299 , 792 , 458 m s - 1 × 1 299 , 792 , 458 s ⇒ s = 1 m . This is because light is very fast in the universe, if we try to change 1 299 , 792 , 458 to 1 300 , 000 , 000 . It will make huge error in defining the standard of meter. We can't compromise with the accuracy of measurement. Second part, If we choose 1 sec to travel by the light then it will be 300 , 000 , 000 meter we won't able to make the standard meter stick because this stick will become 300 , 000 , 000 times of the meter stick which we are using today.

The meter is defined as the distance travelled by light in 1 299 , 792 , 458 second. Why didn't people choose some easier number such as 1 300 , 000 , 000 second? Why not 1 second?

The speed of light in vacuum is 299 , 792 , 458 m s - 1 and one meter is defined as the distance travelled by light in a vacuum. As we know that, s = v t ⇒ s = 299 , 792 , 458 m s - 1 × 1 299 , 792 , 458 s ⇒ s = 1 m . This is because light is very fast in the universe, if we try to change 1 299 , 792 , 458 to 1 300 , 000 , 000 . It will make huge error in defining the standard of meter. We can't compromise with the accuracy of measurement. Second part, If we choose 1 sec to travel by the light then it will be 300 , 000 , 000 meter we won't able to make the standard meter stick because this stick will become 300 , 000 , 000 times of the meter stick which we are using today.

EASY

JEE Main

IMPORTANT

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The meter is defined as the distance travelled by light in $\frac{1}{299, 792, 458}$ second. Why didn't people choose some easier number such as $\frac{1}{300, 000, 000}$ second? Why not $1$ second?

Important Questions on Introduction to Physics

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 2

What are the dimensions of

$(a)$ the volume of a cube of edge $a$ ?

$(b)$ the volume of a sphere of radius $a$ ?

$(c)$ the ratio of the volume of a cube of edge $a$ to the volume of a sphere of radius $a$ ?

EASY

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 3

Suppose you are told that the linear size of everything in the universe has been doubled overnight. Can you test this statement by measuring sizes with a metre stick? Can you test it by using the fact that the speed of light is a universal constant and has not changed? What will happen if all the clocks in the universe also start running at half the speed?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 4

If all the terms in an equation have the same units, is it necessary that they have the same dimensions? If all the terms in an equation have the same dimensions, is it necessary that they have the same units?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 5

If two quantities have the same dimensions, do they represent the same physical content?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 6

It is desirable that the standards of units be easily available, invariable, indestructible and easily reproducible. If we use the foot of a person as a standard unit of length, which of the above features are present and which are not?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>QUESTIONS FOR SHORT ANSWER>Q 7

Suggest a way to measure:

$(a)$ the thickness of a sheet of paper and

$(b)$ the distance between the sun and the moon.

EASY

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>OBJECTIVE I>Q 1

Which of the following sets cannot enter into the list of fundamental quantities in any system of units?

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JEE Main

IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 1 - Introduction to Physics>OBJECTIVE I>Q 2

A physical quantity is measured and the result is expressed as

n u

, where

u

is the unit used and

n

is the numerical value. If the result is expressed in various units, then

The meter is defined as the distance travelled by light in 1299,792,458 second. Why didn't people choose some easier number such as 1300,000,000 second? Why not 1 second?

Important Questions on Introduction to Physics

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The meter is defined as the distance travelled by light in $\frac{1}{299, 792, 458}$ second. Why didn't people choose some easier number such as $\frac{1}{300, 000, 000}$ second? Why not $1$ second?