Question

is used to measure the speed of an automobile.
a) RADAR b)SONAR
c)Doppler d)Ultra sonogra
1 mole of any substance contains_ molecules.
23
a)6.023 x 10 b)6.023 x 10 c)3.0115 x 102 d)12.04
23​

Answer 1

Answer:

1. Doppler

2.6.022 *10 23