explain why astronomers call such an object a blackbody?

You’re in a potions class and your friend has a bubbling cauldron of soup. You measure with a super-magic thermometer that reads 1808 K. Your skin is measured at 33 °C. Assume both examples radiate like a blackbody. a) What wavelength does the soup radiate at maximum intensity and which region of the electromagnetic spectrum does this wavelength correspond? b) Repeat part a) for your skin.

Visible light is O a large portion of the full electromagnetic spectrum. O the only phenomenon presented during the lectures on Light. O a small portion of the full electromagnetic spectrum. O a portion of the electromagnetic spectrum that ranges from microwaves to ultraviolet light ... .. ..*** ...

As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump from one part of the object to another. The other friend says that the sparks are caused by the photoelectric effect. Prove or disprove the latter idea using basic physics. Suppose the typical work function of the metal is roughly 3.630 × 10-19 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal. wavelength: Å