Find the wavelength of light L= 0.6m
x= 0.22m
d= 1.9x10^-6 m
lambda/d= x/L
I know the ansewr is lambda=6.96x10 ^-7m

But I do not understand why the exponent is -7? ​

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

Ibelieve the answer is b

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