### A level south west regional mock gce 2022 physics 2

A level south west regional mock gce 2022 physics 2

Section 1: (One hour). Answer all the questions

1. a) The EMF of a thermocouple is given approximately by the equation: E— ctA I + P(AT) , where AT is the

thermodynamic temperature difference between the junctions. Given that the equation is homogeneous,

determine the base units of the constants a and p.

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(b) Given that the values of the constants a and P in SI units are 6.93 x 10 and -2.10 x 10 respectively, and

that the temperature of the cold junction is 273 K, calculate the probable temperature of the hot junction when

E = 3.25 mV. (6 marks)

2. A highly insulated calorimeter contains 0.050 kg of ice and 0.10 kg of water. Steam at 100 C is passed in

until the iceJust melts. Determine the:

a) quantity of water now in the container.

b) equilibrium temperature attained by the mixture if the mass of the steam is doubled

State any assumption made in your calculation (6 marks)

3. U-235 and U-238 are both isotopes of the same element

a) Explain the meaning of the bolded word

b) In the fission of U-235 energy is released. |2|<7 + In = f°Kr + 1te^a + 2In

Calculate the amount of energy released given that

2llU = 235.004 u; In = 1.009 u; fgtfr = 89.920 u; x\\Ba = 153.923 u . (5 marks)

4. a) State the laws of Electromagnetic induction.

(b)You are provided with a bar magnet, a centre- zero galvanometer, a long copper wire (about 150 cm long).

With the aid of a diagram, explain briefly how any of the above laws can be investigated.