Question

The emissive power of sphere of area 0.02 m² is 0.5 Kal s-¹ m-² what is the amount of heat radiated by the spherical surface in 20 second ?

Answer 1

Answer:

Explanation:

Given :

• Area (A) = 0.02 m²
• Emissive power (E) = 0.5 kal s-¹ m-²
• Time (t) = 20 s

To Find :

• Amount of heat, Q.

Formula to be used :

• Q = EAt

Here,

• E = emissive power
• A = area
• t = time

Solution :

★Amount of heat,

Q = EAt

⇒ Q = 0.5 × 0.02 × 20

⇒ Q = 0.01 × 20

⇒ Q = 0.2 Kal

Hence, Amount of heat is 0.2 Kal.

Answer 2

$\huge\mathcal\colorbox{grey}{{\color{white}{★ANSWER★}}}$

$\huge\color{grey}{\textbf{\textsf{GIVEN :-}}}$

• Area (A) = 0.02 m²
• Emission power (E) = 0.5 kal s-¹ m-²
• Time (t) = 20 sec

$\huge\color{grey}{\textbf{\textsf{TO FIND :-}}}$

• The amount of heat radiated by the spherical surface.

$\huge\color{grey}{\textbf{\textsf{FORMULA :-}}}$

• Q = EAt

$\huge\color{grey}{\textbf{\textsf{SOLUTION :-}}}$

Q = EAt

→ Q = 0.5 × 0.02 × 20

→ Q = 0.01 × 20

→ Q = 0.2 kal

Hence, the amount of heat radiated by the spherical surface is 0.2 kal.

Hope it Helps Buddy ♥️