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Describe the basic principles of ultrasound imaging (2 marks)

Ultrasound is any frequency above that of human hearing - around 20 kilohertz . Ultrasound imaging works by emitting a known intensity of ultrasound at a specific frequency, and capturing the reflected sound...
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Answered by Alex G. • Physics tutor
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Find the integral between 1 and -2 for (4-x^2-3x^3)

= [4x - 1/3x 3 - 3/4x 4 ] 1 -2 = (4(1) - 1/3(1) 3 - 3/4(1) 4 ) - (4(-2) - 1/3(-2) 3 - 3/4(-2) 4 ) =(2 11/12) - (-8 + 8/3 - 12) =(2 11/12) - (-17 1/3) = 20 1 /4
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Answered by Alex G. • Maths tutor
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Would you expect a calcium ion to be bigger, smaller or the same size as a calcium atom? Give TWO reasons to explain your answer.

Calcuim is in group two which means when it forms an ion it will donate its two outer elections, this means a calcium ion will be smaller as it has one less shell of electrons.
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Answered by Urma C. • Chemistry tutor
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Respiration and photosynthesis-what are the similarities and differences?

Respiration in both animals and plants Photosynthesis only in plants Will explain further in interview
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Answered by Abuzar A. • Biology tutor
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(x + 2)(x + 3)(x + 6)

First: (x + 2)(x + 3) = x 2 + 5x + 6 Second: (x 2 + 5x + 6)(x + 6) = x 3 + 5x 2 + 6x + 6x 2 + 30x + 36 = x 3 + 11x 2 + 36x +36 Answer: = x 3 + 11x 2 + 36x +36
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Answered by Urma C. • Maths tutor
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