Which of the following is NOT a medium through which a mechanical wave can travel? A. vacuum
B. gas
C. liquid
D. solid

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions

The diagin dilutepage 6 of 12a6a5(a)fluorine, chlorine, bromine and iodine are placed in the same group of theperiodic table.state the common name used to describe elements in this group.(i)state the group in which the elements are placed and explain whythey are placed in that group.(ii)which of the above named elements is a solid at roomtemperature and pressure?