Answer:
399
Step-by-step explanation:
The light of the bulb falls on the poster which is considered a colored surface that absorbs the visible light "that consists of 7 spectrum colours" and reflect it's own color
Well your going to need 5, since 4 wouldn't be enough, 4 would only be 24.
Answer:
C. 
Step-by-step explanation:
Based on the right triangle altitude theorem, the altitude, y, in the diagram above, equals the geometric mean of 9 and 7.
This implies => 
Thus, solve for y.
The answer is C.
Answer:
at right angles. ...................electromagnetic waves is propagated when the electric and magnetic field component oscillate at right angles to each other. A changing electric field will produce a changing magnetic field and a changing magnetic field produces a changing electric field.
Step-by-step explanation:
