The density of 400 cm3400 \text{ cm}^3400 cm3 of palm oil was 0.9 g⋅cm−30.9 \text{ g}\cdot\text{cm}^{-3}0.9 g⋅cm−3 before frying. If the density of the oil was 0.6 gcm−30.6 \text{ gcm}^{-3}0.6 gcm−3 after frying, assuming no loss of oil due to spilling, its new volume was?
360 cm3360 \text{ cm}^3360 cm3
600cm3600 cm^3600cm3
240cm3240 cm^3240cm3
800cm3800 cm^3800cm3
Natural radioactivity consists of the emission of
α-particles and β-rays
α-particles and X-rays
α-particles, β-rays, and γ-rays
γ-rays and X-rays
Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
Heat → Light → Sound → Kinetic
Heat → Kinetic → Electricity → Heat and Light
Kinetic → Light → Heat → Electricity
Electricity → Kinetic → Heat → Light
If the fraction of the atoms of a radioactive material left after 120120120 years is 164\frac{1}{64}641, what is the half-life of the material?
202020 years
101010 years
222 years
242424 years
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