The total radiant energy per unit area, normal to the direction of incidence

The Total Radiant Energy Per Unit Area Normal To The Physics QuestionThe Total Radiant Energy Per Unit Area Normal To The Physics Question

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by: (where σ is Stefan’s constant)

Options

(a) σr²T⁴ / R²
(b) σr²T⁴ / 4πr²
(c) σr⁴T⁴ / r⁴
(d) 4π σr²T⁴ / R²

Correct Answer:

σr²T⁴ / R²

Explanation:

E = S / S₀ σT⁴ = 4πr² / 4πR² σT⁴
σr²T⁴ / R²

AddThis Website Tools
AIPMT2010
admin:

Related Questions

  1. According to Hook’s law of elasticity, if stress is increased, the ratio of stress
  2. An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor
  3. A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length
  4. In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
  5. A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal