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a bat emits sound waves with a range of wavelengths. Some of the sound waves will be diffracted by the insect. Complete the following sentences to explain why. [2 marks] Diffraction is caused by the sound waves _______________________________________

spreading out
RT
Answered by Ralph T. • Physics tutor
3898 Views

Take quadratic equation x^2-6x+14=0 and its solutions a and b. What is a/b+b/a?

In this kind of exersise it is easy to use Viète's formula for quadratic equations: Let: a+b = S a b=P then x 2 -Sx + P=0 In our case, S=6 and P=14 by multiplying the fractions we get: (a a)/(a b)+(b b)/(a b...
AM
3369 Views

Why can't you divide something by 0?

Let's go back to the definition of division: If we have a number o apples a and b persons to share them with, we can say that each person gets a/b apples. Example: 4 apples and 2 persons : 4/2= 2 apples for ...
AM
4416 Views

What is an acid and what is the difference between and strong and weak acid

An acid is a proton donor. The acid molecule may have one or more protons that it can lose depending on its structure, however generally the second proton is much less acidic (meaning that it is lost much le...
LS
Answered by Lea S. • Chemistry tutor
3321 Views

Expand and simplify (3 + 4*root5)(3 - 2*root5)

Using FOIL to expand the brackets we get 9 - 6 root5 + 12 root5 + 8*root5^2 Square rooting then squaring a number cancels out, so we are left with 8*5 or 40 for the last term. Simplify to give 9 + 6*root5 + ...
CM
Answered by Callum M. • Maths tutor
4498 Views