Question

Two graphs $X$ and $Y$ draw between emissive power ($E_{\lambda })$ and wavelength ($\lambda$)for a black body at ${127}^{o}C$ and ${527}^{o}C$ respectively are shown in diagram.If A be the area lying between $E_{\lambda }-\lambda$ graph and $\lambda$-axis for graph $X$ then this area for graph $Y$ will be:

• A. $2A$
• B. $4A$
• C. $8A$
• D. $16A$

Answer 1

The correct option is A $2A$

$(\lambda T{)}_{max}=constant$
$\left(Area\right)\alpha \left(\lambda \right)$
$A\times ({52}^n+273)=A_y\times (127+273)$
$A_y=2A$