Wavelength = 434nm = 434 x 10⁻⁹m planck's constant = <span>h= 6.626 x 10 ⁻³⁴ J E =? by using the formula; E = hc /</span>λ value for c is 3 x 10⁸ m/s E = (6.626 x 10 ⁻³⁴ J)(3 x 10⁸ m/s) / 434 x 10⁻⁹m E = 1.9878 x 10⁻²⁵ / 434 x 10⁻⁹m E = 4.58 x 10⁻¹⁹ joules
For example, friction between our shoes and the floor stop us from slipping and friction between tyres and the road stop cars from skidding. Friction is sometimes unhelpful. For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases.
