1. What is the wavelength of a radio wave with a frequency of 64.2 kilohertz? 2.
ID: 2091016 • Letter: 1
Question
1. What is the wavelength of a radio wave with a frequency of 64.2 kilohertz? 2. A piece of metal is heated from a temperature of 27 oC to a temperature of 613 oC. How many more times the energy (amount) does the metal emit as blackbody radiation at the higher temperature than at the lower temperature? 3. What is the wavelength of the peak of the blackbody radiation curve for an emitter at temperature 240 K? You will need to write your answer in scientific notation and enter only the decimal part of the answer. Remember to write your answer as the number x 10-6 and enter only the decimal number before the 10-6. Enter your answer to two decimal places. For example, 0.00000935 is 9.35 x 10-6 and 0.00001935 is 19.35 x 10-6 so you would enter only the 9.35 or 19.35 as your answer.You do not need to enter the units for this question. 4. What is the frequency (in kHz or 103Hz) of a wave with a measured wavelength of 870 m? Remember that you have to enter the value in kHz, which is the value in Hz divided by 1000. For example, 500,000 Hz = 500 kHz. 5. What is the temperature (in degrees K) for radiation emitted that has a max wavelength (?max) of 7.6 x 10-6 m?Explanation / Answer
3)
lambda =b/T
b= 2.89*10^3
T=240k
lambda= 2.89*10^-3/240
=0.0120416666666667 *10- 3
= 12.04 *10^-6m
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