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Figure 1 shows a solar-powered charger for a mobile phone - Edexcel - GCSE Physics - Question 1 - 2016 - Paper 1
Question 1
Figure 1 shows a solar-powered charger for a mobile phone. The screen of the solar cell takes in energy from the Sun.
Worked Solution & Example Answer:Figure 1 shows a solar-powered charger for a mobile phone - Edexcel - GCSE Physics - Question 1 - 2016 - Paper 1
Step 1
Step 2
Step 3
1(a)(iii) Calculate the energy transferred to the battery if the area of the screen is 77 cm² and it absorbs 0.12 J/cm².
Answer
To calculate the energy transferred:
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Calculate the area: Area = length × width = 7 cm × 11 cm = 77 cm².
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Substitution: Energy = Area × absorption per unit area = 77 cm² × 0.12 J/cm².
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Final Calculation: Energy = 9.24 J, which can be rounded to 9.2 J.
Step 4
1(b) Explain why the heating effect for the oven and the phone differs.
Answer
The heating effect differs because:
- The heating effect for the oven and the phone depends on their power outputs. Since the power of an oven is much greater than that of a phone, it produces a greater heating effect.
- Additionally, microwave ovens emit waves that can vary in wavelength, whereas the phone operates at different wavelengths, which affects the heating efficiency.