The frequency of the electromagnetic radiation that emits.

Question

(a) The blackbody radiation emitted from a furnace peaks at a wavelength of 4.5 10-6 m (0.0000045 m). What is the temperature inside the furnace? (in K) (b) The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 4 V AC. For each 1,400 turns in the input coil, how many turns are there in the output coil? (Round your answer to at least one decimal place.)

Answer 1

Question

Chapter 8, Problem 14P

To determine

The frequency of the electromagnetic radiation that emits.

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(a) The blackbody radiation emitted from a furnace peaks at a wavelength of 4.5 10-6 m (0.0000045 m). What is the temperature inside the furnace? (in K) (b) The charger cord used to recharge a cell phone contains a transformer that reduces 120 V AC to 4 V AC. For each 1,400 turns in the input coil, how many turns are there in the output coil? (Round your answer to at least one decimal place.)

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?

To measure temperatures, physicists often use the variation of intensity of EM radiation emitted by an object. The wavelength at which the intensity is greatest is given by the equation: λmaxT = 0.2898 cm.K where λmax is the wavelength of greatest intensity and T is the temperature of the object in kelvins. In 1965, microwave radiation peaking at λmax = 0.107 cm was discovered coming in all directions from space. To what temperature, in a) K b) °C c) °F, does this wavelength correspond?