During a nuclear explosion, the core of the explosion reaches temperatures of about 10,000,000K.What wavelength of light would be emitted by such explosion?

What is the lowest temperature that will cause a blackbody to emit radiation that peaks in the visible light range?(Hint:this is going to be a very large number!)

The equation for the power emitted by the human body is . If the area of the human body is 3.5m²,what is the power radiated by the human body when the temperature is 25 degrees celsius?

Satellite radio technology around the world uses radio waves of frequency of about1.4GHz. What is the wavelength of such waves? (the answer is NOT 2.31)

Satellite radio technology in the USA uses radio waves of wavelength 0.13m.What is the frequency of such waves? (the answer is NOT 2.31)