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Update ICSE - X Physics Board Paper 2024.txt

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ICSE - X Physics Board Paper 2024.txt CHANGED
@@ -67,12 +67,12 @@ Q = mL = 500 × 330 = 165,000 J
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  SECTION B (40 MARKS)
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  Question 4 (10 marks)
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- (i) Solution:
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  1/v - 1/u = 1/f
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  1/72 + 1/36 = 1/f
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- 3/72 = 1/f
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- f = 24 cm
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- Power = 100/24 = 4.17 D
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  (ii)(a) Microwave
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  (ii)(b) X-rays
 
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  SECTION B (40 MARKS)
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  Question 4 (10 marks)
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+ (i) (3 marks) Solution:
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  1/v - 1/u = 1/f
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  1/72 + 1/36 = 1/f
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+ 3/72 = 1/f (1 mark for working)
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+ f = 24 cm (1 mark)
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+ Power = 100/24 = 4.17 D (1 mark)
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  (ii)(a) Microwave
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  (ii)(b) X-rays