Question

In MKS system, Stefan's constant is denoted by $\sigma$. In CGS system multiplying factor of $\sigma$will be

• A. 1
• B. $10 ^ { 3 }$
• C. $10 ^ { 5 }$
• D. $10 ^ { 2 }$

Answer 1

Answer: (B)

$10 ^ { 3 }$

Answer 2

In M.K.S. system unit of σ is

$\frac { J } { m ^ { 2 } \times \sec \times K ^ { 4 } }$

⇒ $1 \frac { \mathrm { J } } { \mathrm { m } ^ { 2 } \times \sec \times K ^ { 4 } } = \frac { 10 ^ { 7 } \mathrm { erg } } { 10 ^ { 4 } \mathrm {~cm} ^ { 2 } \times \sec \times K ^ { 4 } }$

$= 10 ^ { 3 } \frac { e r g } { \mathrm {~cm} ^ { 2 } \times \sec \times K ^ { 4 } }$