An incandescent lightbulb is desired to emit at least 71 percent of its energy at wavelengths shorter than 2.6 µm. Determine the minimum temperature to which the filament of the lightbulb must be heated. Use the Blackbody radiation functions table.   The minimum temperature (T) to which the filament of the lightbulb must be heated is ____ K.

Platinum has a prominent x-ray emission line at 66.8 keV.   (a) What is the minimum speed (in m/s) of an incident electron that could produce this emission line?       m/s     (b) What is the wavelength (in m) of a 66.8 keV x-ray photon?  m

For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body’s absolute temperature:(T in kelvins)and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body’s absolute temperature according to:( in meters, T in kelvins)Assume an object is emitting blackbody radiation.   A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K.

For light with a wavelength of 350 nm and with an intensity of /= 10-8 W/m², what is the number of photons/(m²s) in the light beam?

How many 890-nm photons does it take to have the same total energy as five 178-nm photons? ____photons

Problem 10: We observe photons of light coming from a bright star in the night sky. One of those photons has a frequency 6.9 x 10¹4 Hz (or cycles per second). DS What is the energy of the photon in joules? Energy -

Consider a fission nuclear explosion producing a temperature of 24 million K (25∗107 K). a) What is be the peak wavelength of the thermally produced photons? b) What is the energy (in eV) for this peak wavelength photon?

Recall that the threshold frequency (νthreshold) for a metal is related it the metal's work function (Φ) by Eminimum= Φ = hνthreshold.  For a particular metal, Φ is 7.70×10-19 J. What is the longest wavelength of electromagnetic radiation that can eject an electron from the surface of a piece of the metal?  In nm   If light has a wavelength of 635 nm, what is the energy of this light expressed with units of kJ/mol?     A beam of radiation has an energy of 2.95×102 kJ/mol. What is the wavelength of this light? In nm

How many photons per second are emitted by the antenna of a microwave oven, if its power output is 1.25 kW at a frequency of 2510 MHz? _______ photons/s

What is the energy range (in joules and eV) of photons in the visible spectrum, of wavelength 410 nm to 740 nm ? Express your answers using two significant figures. Enter your answers numerically separated by a comma. ΜΕ ΑΣΦ Emin, Emax = Submit Request Answer Part B ? J Express your answers using two significant figures. Enter your answers numerically separated by a comma. Emin, Emax = Η ΑΣΦ ? eV Submit Request Answer