please do 4 or 5 th both it is very urgent
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ans 4. the following events take place after fertilisation in flowers-
1. the petals fall off.
2. ovary starts to swell and forms fruit.
3. seeds are also formed.
ans5. r=1.50
speed of light in air= 3×10^8
calculating speed of light in benzene
1.50=3×10^8/speed of light in benzene
speed of light in benzene= 3×10^8/1.50
= 30×10^8/15
= 2×10^8
now,
speed reduced= 3×10^8 - 2×10^8
= 1×10^8
so,
pecentage of speed reduced= =1×10^8×100÷3×10^8
= 100÷3
= 33.333% (approx)
1. the petals fall off.
2. ovary starts to swell and forms fruit.
3. seeds are also formed.
ans5. r=1.50
speed of light in air= 3×10^8
calculating speed of light in benzene
1.50=3×10^8/speed of light in benzene
speed of light in benzene= 3×10^8/1.50
= 30×10^8/15
= 2×10^8
now,
speed reduced= 3×10^8 - 2×10^8
= 1×10^8
so,
pecentage of speed reduced= =1×10^8×100÷3×10^8
= 100÷3
= 33.333% (approx)
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