
The dimensions of heat capacity are:
A.
B.
C.
D.
Answer
499.5k+ views
Hint: We know that heat capacity is defined as the heat required to raise the temperature of a substance by 1 unit of temperature. Now, to reduce a quantity to its dimensional form means expressing the units of the quantity in terms of just powers of mass, length, time and temperature. In other words, reduce the units of heat capacity from the SI units to the base units by taking the heat energy and the change in temperature in terms of the base units. Following this, assign the powers of the base units to the fundamental quantities of the dimensional formula to arrive at the appropriate dimensions for heat capacity.
Formula used:
Heat capacity
Complete answer:
Let us begin by establishing an understanding of heat capacity.
Heat capacity, also known as thermal capacity is a measurable physical quantity that characterizes the amount of heat required to raise the temperature of the substance by , and is given as the ratio of the amount of heat energy Q transferred to a substance to the resulting increase in the temperature ( ) of the substance, i.e.,
and is usually measured in
Now, a dimensional formula for any physical quantity looks like , where M, L, T and K, are the mass, length, time and temperature respectively, and x, y, z and a are any integers representing dimensions.
Let us now try to dimensionally analyse what our definition of heat capacity looks like.
For this, let us deconstruct the heat capacity expression to its dimensional notation by evaluating the dimensions of heat transfer and temperature.
The heat energy Q transferred is measured in joules (J), which in base units is expressed as
Therefore, the dimensional formula for Q will be
The change in temperature is measured in kelvin (K), therefore, the dimensional formula for will be
Putting this all together is the expression for heat capacity, we can get its dimensional formula as:
So, the correct answer is “Option B”.
Note:
The dimensional formula allows us to express the unit of a physical quantity in terms of the fundamental quantities mass (M), length (L), time (T) and temperature (K).
However, while reducing the dimensional formula from the base units be careful in assigning the right power to the right fundamental quantity each time as any discrepancy in the dimension will result in an anomalous nature of the quantities involved.
Formula used:
Heat capacity
Complete answer:
Let us begin by establishing an understanding of heat capacity.
Heat capacity, also known as thermal capacity is a measurable physical quantity that characterizes the amount of heat required to raise the temperature of the substance by
Now, a dimensional formula for any physical quantity looks like
Let us now try to dimensionally analyse what our definition of heat capacity looks like.
For this, let us deconstruct the heat capacity expression to its dimensional notation by evaluating the dimensions of heat transfer and temperature.
The heat energy Q transferred is measured in joules (J), which in base units is expressed as
Therefore, the dimensional formula for Q will be
The change in temperature
Putting this all together is the expression for heat capacity, we can get its dimensional formula as:
So, the correct answer is “Option B”.
Note:
The dimensional formula allows us to express the unit of a physical quantity in terms of the fundamental quantities mass (M), length (L), time (T) and temperature (K).
However, while reducing the dimensional formula from the base units be careful in assigning the right power to the right fundamental quantity each time as any discrepancy in the dimension will result in an anomalous nature of the quantities involved.
Recently Updated Pages
Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Social Science: Engaging Questions & Answers for Success

Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Trending doubts
1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

What is the technique used to separate the components class 11 chemistry CBSE

Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

Give two reasons to justify a Water at room temperature class 11 chemistry CBSE
