Au, Ag, and Cu are all metals. What characteristics will these three elements have in common?
a. Poor conductors of heat, poor conductors of electricity, and dull
b. Shiny, good conductors of heat and electricity
c. Semiconductors or heat and electricity and used as chips in computers and phones

B

Explanation:

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.