Radiation: The rate of energy radiated.

Related BrainMass Solutions

• Photon and Radio Waves

  (b) What is the energy (in electron-volts) of the individual quanta that compose the radiation? How many photons are emitted per second? per cycle of oscillation?

• Quantum Physics: Classical theory is energy radiated by a blackbody approached infinity as the wavelength of the emitted light approaches zero.

  The radiated energy can be considered to be produced by standing wave or resonant modes of the cavity which is radiating. The amount of radiation emitted in a given frequency range should be proportional to the number of modes in that range.

• Thermal Radiations: Stefan-Boltzmann law; rate of heat loss

  If the emissivity of the person's surface is 1, what is the energy loss per second to the nearest tenth of a watt? Answer: The Stefan's law gives the emissive power of a body due to radiation.

• Sun's Nuclear Reaction and Radiation

  -29 kg (a) The total luminosity (energy radiated per second) of the sun = 4 x 1026 W = 4 x 1026 J/s So rate of mass being converted into energy per second, m E / c2 = E / (3.0 x 108 m/s)2 = (4 x 1026 J) / (9.0 x 1016m2/s2) = 4.44 x 109 kg

• Black Body radiation

  Derive Stefan's law for the power radiated per unit area by a black body, and obtain an expression for the Stefan-Boltzmann constant which appears in the law. Obtain an expression for the entropy density of black-body radiation.

• Thomson's e/m apparatus, diffraction grating Compton Effect

  (a) Estimate the power radiated by a 25 cm diameter basketball at 18°C. wrong check mark W (b) Estimate the power radiated by a human body (assume a tempertare of 37°C).

• Particle moving perpendicular to a constant magnetic field

  so that the loss of energy due to the cyclotron radiation will cause the kinetic energy to decay with time as $$ K(t) = K(0)e^{-t/t_c}.

• Industries Contributing to Greenhouse Effect

  Energy hitting the earth is absorbed- heating the planet. Some of this is then radiated back (infra-red) into the atmosphere warming gas molecules in the atmosphere. 2.

• Helium Electrons

  Energy difference of level 2 and 3 == energy radiated => delta E (2-3) = E(n=3) - E(n=2) = h*c/lamda h: Planck's constant = 6.67*10^(-34) J.s; c: speed of light = 3*10^8 m/s; lambda: wavelength of radiation emitted = ?