Two tuning forks are played at the same time. one has a frequency of 490 hz and the other is 488 hz. how many beats per second are heard? 490 488 2 4

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false