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When we see light, the colour of light that we see is determined by the wavelength of the light. Violet light has the shortest wavelength, and red light has the longest wavelength. Red shift happens when we ...

Imagine we have a wave that is travelling from left to right. This is the wave's direction of motion, or what is sometimes called the direction of "energy propagation". In a transverse wave the par...

To solve this, we need to factorise the expression (write as a product of two brackets). To do this we want to find to numbers that multiply to make +6 and add up to -5, for this case. These numbers turn out...

We know that the question is asking us to take the number 36 to the power of 0.5. By assumption 0.5 can be written as 1/2. To take 36 to the power of a 1/2 we take it to the root of the denominator and then ...

zy=28 so y=28/z13=2z-3y13= 2z - (28 x 3)/z13=2z-84/zmultiply each side by z to give 13z = 2z 2 -84rearange for a quadratic2z 2 -13z-84=0solve by factorising(2z+8)(z-21/2)z= -4 0r 21/2substitute -4 into both ...