Mark Scheme

Question 1

••': :-~Q\$stfMi^ Answer Note

Part Mrk

(a) 1 Convex

(b) 1 Refraction

(c)(i)(ii)

1

1

Remain unchangedConstant power // same focal length

Tot/Jum : 4

Question 2

--Q2iS3^.V Answer Note

Part Mrk

(a) 1 Gravitational force// force of gravity// w=mg

(b)(i) 1

1

Weight = upthrust

Net force is zero

(b)(ii) 1

1

3200-2000 = 1200a

a = 6ms'2Tot/Jum: 5

Question 3m^ommm- Answer Note

Part Mrk

(a) 1 Transverse wave.

(b)(i) 1

2

Two straight lines from water converge onto screen toform bright band.

Two straight lines from water diverge onto screen toform dark band.

(b)(ii) 1 Mark a straight line between two consecutive darkbands and label X.

(<0 1

2

Measure distance between // consecutive bright/darkbands, /// Using mechanical stroboscope to freeze the

water wave.

Calculate average of the wavelength, X =/ / n -1.

n at least 3 or more

Tot/Jum : 6

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