HANDWRITTEN ANSWERS ONLY (NOTEXT)

HANDWRITTEN ANSWERS ONLY (NOTEXT)

HANDWRITTEN ANSWERS ONLY (NOTEXT)

Question 8 (2 marks) In the two circuits below, each of the resistors has the same value, R. (2) Which circuit has the larger equivalent resistance? Justify your answer including relevant formulas.Question 9 (3 marks) To deaden pain in minor operations, a liquid that vaporises easily is sometimes sprayed onto the skin. Using thermodynamic principles, explain how this liquid cools the skin and when the effect ends. Question 10 (4 marks) A current-carrying wire runs horizontally across a table. The conventional current direction, I, is running from left to right. The wire produces a magnetic field of 2.8 x 10 T measured 15.4 cm from the wire A. What current must the wire be carrying to produce this field? 3 Marks B. Draw a diagram showing the direction of the magnetic field around the wire. 1 Mark Page 9 / 13 +Question 11 (4 marks) The audible range of frequency for a healthy human is from 20 Hz to 20 kHz. If the speed of sound in air is 340 m s'1 to what range of wavelengths do these frequencies correspond? Question 12 (5 marks) The following figure represents a situation involving the refraction of light. medium 1 D medium 2 For each label write the corresponding name A B C D EQuestion 13 (4 marks) A. Some galaxies appear to have a red shift in colour. meaning the light they produce seems redder once it reaches Earth. Making reference to the Doppler Effect and spectrum, explain why this happens and how this relates to the relative movement of these galaxies with respect to Earth. (3 Marks) . State why the value of vsource would be positive or negative. (1 Mark) Question 14 (5 marks) In the following table, classify the following examples of pulses as mechanical or electromagnetic and transverse or longitudinal. Source mechanical or electromagnetic transverse or longitudinal P wave Rayleigh wave Waves produced by the wind on the water Visible light from the Sun Waves produced by the vibrating air column of a tromboneQuestion 15 (5 marks) Fill in the spaces in the following table. Show your working in the space below the table. Remember the units in each case. Show working in space below