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a) K=R/NA
b (i) 1.7X10^-2
(ii) 1.0X10^22
(iii)3X10^-24

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2)a)K=R/Na
b)i)PV=nRT
P=1.7mPa
R=8.31JK^-1mol^-1
T=20C=293K
V=25cm^3
n=PV/RT
n=1700000*2.5*10^-5/8.31*293
n=0.017mol
ii)Na=6.02*10^23
0.017*6.02*10^23=1.1*10^22
iii)Na=6.02*10^23
m=2g
2/6.02*10^23=3.3*10^-24

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a) reflection / wave in similar amplitude / similar frequency / reflected wave loss few energy in the wall  (khairiah)

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a) reflection / wave in similar amplitude / similar frequency / reflected wave loss few energy in the wall  (khairiah)

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a) waves have same amplitude and frequency, two waves travelling in opposite direction.
b)perpendicular to rest position of the string.
c)B is smaller than A
d)lambda=1.2m
c=6.2ms
c=f*lambda
f=6.2/1.2=5.16=5.2Hz

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a) waves have same amplitude and frequency, two waves travelling in opposite direction.
b)perpendicular to rest position of the string.
c)B is smaller than A
d)lambda=1.2m
c=6.2ms
c=f*lambda
f=6.2/1.2=5.16=5.2Hz

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1.7.3 Multiple slit problems (In class Questions) (1)

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Diffraction: the spreading of waves when they pass through a gap.

2: when the gap is bigger than the visible lights wavelength, it will pass through without spreading. (no diffraction)