Answer
Verified
389.7k+ views
Hint: We’re given four units out of which we have to choose the unit that doesn’t measure length. For that, we have to go through the definitions of each unit and infer what it symbolizes. This will make it easier to arrive at a conclusion.
Complete Step by step answer: We know that Fermi is the unit of length where 1 Fermi is equal to \[{{10}^{-15}}\]metres. It is similar to the value of the diameter of a proton. It measures distances in atomic units.
Considering Debye, we can say that it is the unit which helps to express the electric dipole moments that exist between molecules. The value of one Debye is equal to $3.336\times {{10}^{-30}}Cm$ (Coulomb metre). It is also considered as the unit of force in the CGS system.
Our next option is micron, which is the unit of length that is equal to one millionth of a metre. It is used to measure the tiniest of all quantities. One micron is ${{10}^{-6}}m$ and it is used in various scientific and technological fields.
The last option is light year, which is a unit of astronomical distance which is equal to the total distance travelled by light in a year, that is $9.4607\times {{10}^{12}} km$.
From the definitions of the four options, we can arrive at the conclusion that option B, that is Debye is a unit of force whereas the other three quantities are units of length.
Therefore, option B is the correct answer among the given options.
Note: Light year is often confused by students as a unit of time as it emphasises the word year. However, it measures the distance travelled by light in a year. It is the unit of length. This should be kept in mind.
Complete Step by step answer: We know that Fermi is the unit of length where 1 Fermi is equal to \[{{10}^{-15}}\]metres. It is similar to the value of the diameter of a proton. It measures distances in atomic units.
Considering Debye, we can say that it is the unit which helps to express the electric dipole moments that exist between molecules. The value of one Debye is equal to $3.336\times {{10}^{-30}}Cm$ (Coulomb metre). It is also considered as the unit of force in the CGS system.
Our next option is micron, which is the unit of length that is equal to one millionth of a metre. It is used to measure the tiniest of all quantities. One micron is ${{10}^{-6}}m$ and it is used in various scientific and technological fields.
The last option is light year, which is a unit of astronomical distance which is equal to the total distance travelled by light in a year, that is $9.4607\times {{10}^{12}} km$.
From the definitions of the four options, we can arrive at the conclusion that option B, that is Debye is a unit of force whereas the other three quantities are units of length.
Therefore, option B is the correct answer among the given options.
Note: Light year is often confused by students as a unit of time as it emphasises the word year. However, it measures the distance travelled by light in a year. It is the unit of length. This should be kept in mind.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Assertion The resistivity of a semiconductor increases class 13 physics CBSE
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
The branch of science which deals with nature and natural class 10 physics CBSE
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
Trending doubts
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Draw a diagram showing the external features of fish class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Fill the blanks with proper collective nouns 1 A of class 10 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Select the word that is correctly spelled a Twelveth class 10 english CBSE
How fast is 60 miles per hour in kilometres per ho class 10 maths CBSE