Ihave a special thermos that has a vacuum chamber between my hot soup and its outside wall. because my soup is isolated from its surrounding by a vacuum,

a. my soup will stay warm forever because thermal energy cannot pass through a vacuum.
b. my soup will cool down because of conduction.
c. my soup will cool down because of radiation.
d. my soup will cool down because of convection. e. both b and d.

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

Atomic nuclei of almost all elements consist of

Photons with the highest energy have the longest period