Which type of wall would make the best soundproofing for a room?

A.) 1.0 cm thick glass

B.) two layers of 0.5 cm thick glass with 0.5 cm of air between them

C.) two layers of 0.5 cm thick glass with 0.3 cm of vacuum between them

D.) 1.0 cm thick steel

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c