is most resistant to thermal energy transfers. a. copper wire b. aluminum foil c. water d. foam insulation

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?