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Q1. A rocket of mass 3.18 × 10^5 kg is in flight near earth's surface. Its thrust is directed at an angle of 62.2 ° above the horizontal and has a magnitude of 7.40 × 10^6 N. Find (a) magnitude and (b) direction of the rocket's acceleration. Give the direction as an angle above the horizontal.

Q2. Davisson and Germer Experiment

consider a crystal with the atoms arranged in a cubic array, each atom the distance 0.91 °A from its nearest neighbour. Examine the conditions for Bragg reflection from atomic planes connecting diagonally placed atoms.

(a) Find out the longest wavelength electrons that can produce a first-order maximum.

(b)If 300 eV electrons are used, at what angle from crystal normal must they be incident to produce a first order maximum?

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