The following statements can be applied to certain types of wave:1 Their oscillations are longitudinal.2 They travel at the speed of light in air.3 They are used in pre-natal scanning.4…

The sides of triangle ABC are as follows: AB = 3, AC = 2, BC = 4. Use the cosine rule, a^2=b^2+c^2-2bc cosA , to find the cosine of ∠BAC…

Listed are the electronic configurations for the atoms of different elements. Which one represents the most reactive non-metal? Answer: 5) C As you go along a period, reactivity of non-metal…

The amount of water in urine is controlled by the hormone ADH. Which sequence of events will occur when you need to keep water in your body? Answer: 4) B…

A particular radioisotope X with a half-life of 4 years decays into the stable isotope Y. At a particular time, a sample contains 32 x 10²º atoms of nuclide X…

Compound T has a melting point of 78 °C and a boiling point of 134 °C. T is soluble in water and its solution does not conduct electricity. T has…

The graph shows changes in the mass of glycogen stored in the liver and skeletal muscles. During which periods will the concentration of insulin in the blood be below normal?…