The Cold Light of Fireflies Fireflies are often said to give off "cold light." Part A Given that the peak in a firefly's radiation occurs at about 5.4 x 1014 Hz, determine the temperature of a blackbody that would have the same peak frequency. Express your answer using two significant figures. ΜΕ ΑΣΦ 0 ? T = Submit Request A power. K

(a) For what temperature is the peak of blackbody radiation spectrum at 400 nm? (b) If the temperature of a blackbody is 800 K, at what wavelength does it radiate the most energy?

(a) What is the wavelength of a 1.00-eV photon? (b) Find its frequency in hertz. (c) Identify the type of EM radiation.

Question A7 The intensity of the emitted radiation by a star is at a maximum at a wavelength of 78.9 nm. a) Calculate the surface temperature of the star. b) Calculate the ratio of the intensity radiated at 65.0 nm to the maximum intensity. Assume that the star radiates like an ideal blackbody.

Hz. Find the energy (in eV) of a photon with a frequency of 1.5 x 1016 eV Need Help? Read It

Photons of a certain infrared light have an energy of 1.05 10-19 J. (a) What is the frequency of this IR light?   (b) Use ? = c/f to calculate its wavelength in nanometers.

A photon in a laboratory experiment has an energy of 5.5 eV. What is the frequency of this photon? -34 Planck's constant is 6.63 x 10° J.S. Answer in units of Hz.

What is the energy of a photon if it's frequency is 1.00s-1?

The intensity of blackbody radiation peaks at a wavelength of 523 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature. W/m2 Additional Materials O Reading

You are using a radiometer to observe the thermal radi- ation from an object that is heated to maintain its tem- perature at 1278 K. The radiometer records radiation in a wavelength interval of 12.6 nm. By changing the wave- length at which you are measuring, you set the radiome- ter to record the most intense radiation emission from the object. What is the intensity of the emitted radiation in this interval?