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Answers (2)
Lambda=h/mv v=lambda.m/h and KE=mv^2/2. Lambda(wavelength) is given. So substitute it and do the calculation.
g= GM/R^2 For Planet 1, Let it be g1=GM1/R1^2 And for planet 2, g2=GM2/R2^2[M2=2M1 and R2= 2 R1] So g2=GM1/2R1^2 g2=g1/2=9m/s^2. Hope this helped!!!
