Answer:
A. Diffraction
Explanation:
You can immedietly mark out C and D, they make no sense. And reflection is the bending of light, leaving you with A. Diffraction
You marked this question as mathematics even though it belong in physics, please try to categorize it accordingly next time.
May I have brainliest please? :)
Answer:
It depends...
Explanation:
If you know how much watts the pair of hair straighteners use, you can use that as the energy every second. A normal flat iron for hair would be 300 watts, so we could say that it uses 300 jolts or watts of energy per second.
I think the answer is c) 1
Hope it helps and have a good day
The efficiency of the appliance is 0.62 (62%)
Explanation:
The relationship between the power of the appliance and the energy used by it is
![P=\frac{E}{t}](https://tex.z-dn.net/?f=P%3D%5Cfrac%7BE%7D%7Bt%7D)
where
P is the power
E is the energy transferred in input
t is the time elapsed
For this appliance,
P = 7 W
So, in t = 42 s, the energy transferred in input is
![E_{in}=Pt=(7)(42)=294 J](https://tex.z-dn.net/?f=E_%7Bin%7D%3DPt%3D%287%29%2842%29%3D294%20J)
We are told that the useful energy in output however is
![E_{out}=183 J](https://tex.z-dn.net/?f=E_%7Bout%7D%3D183%20J)
Therefore, the efficiency of the appliance is
![\eta=\frac{E_{out}}{E_{in}}=\frac{183}{294}=0.62](https://tex.z-dn.net/?f=%5Ceta%3D%5Cfrac%7BE_%7Bout%7D%7D%7BE_%7Bin%7D%7D%3D%5Cfrac%7B183%7D%7B294%7D%3D0.62)
Learn more about power:
brainly.com/question/7956557
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