(b) (i) Carbon-12 is a stable isotope. Carbon-14 is an unstable radioactive isotope. Table 12.2 shows the contents of each nucleus.
Carbon-12
Carbon-14
Number of protons
6
6
Number of neutrons
6
8
Table 12.2
Explain why carbon-12 and carbon-14 are isotopes.
[1]

Isotopes are two or more elements with the same number of protons, but different number of neutrons.

So Carbon-12 and Carbon-14 has 6 protons, however Carbon-12 has 6 neutrons and Carbon-14 has 8 neutrons. They have different number of 'neutrons' thus they are isotopes

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y