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Alm 411 \ (Ans. 2.13K) A/m and 477 (Ans. 4.15K) 3x10 4. The magnatic field intensity in the tin material is zero at 3.69 K and at OK. Calculate the temprature of the superconductor if the field intensity 2x10 measrured as 47 4.12.10 5. The magnetic field intensity in the mercury at T = OK is 3x109 Amat 2.3K Calculate the critical temperature. At 16. Estimate the London penetration depth from the following data: Critical temperature = 3.7 K; Density = 7.3 cm Atomic weight = 118.7; Effective mass M*=1.9g (Ans. 381A) 17. The critical temperature for a metal with isotropic mass 199.5 is 4.185 K. Calculate the isotropic mass if the critical temperature falls to 4.133 K. (Ans. 204.35) 18. For a spceimen of V2 Ga the critical field are respectively 1.4 x 10% and 4.2 * 10-a m for 14K and 13K. Calculate the transition temperature and critical field at OK and 4.2K (Ans. 14.47K, 21.9 x 10% A/m, 20 x 10A'm) 19. The actual energy gap at 0 K in lead is 2.73 x 10-3 eV. (a) What is the critical temperature according to BCS theory? (b) Radiation of what minimum frequency could break apart cooper pair in lead at OK? In what part of e.m. spectrum is such radiation? GGY 1011 Uz Microwave wion