Radiation of wavelength 300 nm was passed through a chemical actinometer containing 10 ml of a 0.05M oxalic acid solution and 0.01M uranyl sulphate. The concentration of oxalic acid solution became 0.03M after absorption of 80J radiation energy. Calculate the quantum yield of the photodecomposition of the oxalic acid?
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Answer:
The work needed to be done is 156187 J.
Given :
Initial velocity(u) = 30 km/h = 30 × 5/18 = 25/3 m/s.
Final velocity(v) = 60 km/h = 60 × 5/18 = 50/3 m/s
Mass = 1500 kg
To Find :
Work needed to be done = ?
Solution :
We know the formula to calculate the work done,
So by using it,
➠ Work done = 1/2mv² - 1/2mu²
➠ W = m/2(v²-u²)
➠ W = 1500/2(50/3²-25/3²)
➠ W = 156187 J
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➤ Additional information :
Work is done when a force that is applied to an object moves that object or body!!
The work is calculated by multiplying the force by the amount of movement of an object itself !!
Formula = f × d
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