Question

30 POINTS !! WRONG OR STUPID ANSWERS WILL BE REPORTED!

Answer 1

Wien's law relates the temperature and the peak wavelength of radiation.

It states that Peak wavelength of radiation is inversely proportional to the temperature of the radiation.

1. This means a very hot O type star would emit shorter wavelength radiation. Thus, a very hot, type O star would most likely emit its most intense radiation as Ultraviolet. Ultraviolet radiation has smaller wavelength as compared to other given radiation.

2. A wavelength of 1000 nm corresponds to infrared radiation. Infrared radiation have spectral band from 750 nm to 1000 nm. The peak intensity of radiation for a particular star occurs at a wavelength of 1,000 nm. Thus, it lies in infrared spectral band.

3. From Wien's displacement law:

$\lambda_{peak}=\frac{2.9\times 10^{-3} m.K}{T}\\ \Rightarrow \lambda_{peak}= \frac{2.9\times 10^{-3} m.K}{30,000 K}= 97 nm$

A star has a surface temperature of 30,000 K. Thus, the peak radiation would occur at 97 nm.

Answer 2

The correct answer for is A) ultraviolet Light
The correct answer for the second question is C) Infrared waves
The correct answer for the third question is solved this way
Peak wavelength= 0.0029/T =0.0029/30000 =B)  97nm

Hope this helps let me know. I tried my best.