The particles that carry charge through wires in a circuit are mobile electrons. The electric field direction within a circuit is by definition the direction that positive test charges are pushed. Thus, these negatively charged electrons move in the direction opposite the electric field.
Answer:
1. A substance that can be separated into two or more substances only by a chemical change is a(n) _____.
solution
element
mixture
compound
2.
Which of the following materials is a substance?
air
gasoline
stainless steel
silver
3.
The first figure in a properly written chemical symbol always is _____.
boldfaced
capitalized
italicized
underlined
4.
Which of the following represents a compound?
H
H-3
H2O
O-16
5. What do chemical symbols and formulas represent, respectively?
elements and compounds
atoms and mixtures
compounds and mixtures
elements and ions
Explanation:
<span>average speed
= [(10-3)/12 km] / [(49.5-32.0)/60 hour]
= 5*7 / 17.5
= 2 km/h .</span>
Answer:
D: A mathematical model
<em>Hope </em><em>its right </em><em>if</em><em> </em><em>not </em><em>so </em><em>sorry </em><em>:</em><em>)</em>
Answer:
constructive λ = 130 m
destructive λ = 260 m
Explanation:
a) the expression for constructive interference is that the difference in amino is equal to a multiple of the average wavelength
AQ - BQ = 2m λ/ 2 m = 0, 1, 2, ...
Where
AQ = 130 +50 = 180 m
BQ = 50 m
To find the smallest wavelength let's use m = 1
180 - 50 = 2 1 λ/ 2
λ = 130 m
b) for destructive interference
AQ –BQ = (2m + 1) λ/2
The smallest value is for m = 0
130 = λ / 2
λ = 260 m
