Chapter 37: Q. 3 (page 1081)
Thomson observed deflection of the cathode-ray particles due to magnetic and electric fields, but there was no observed deflection due to gravity. Why not?
The required statement is explained below.
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Rutherford studied alpha particles using the crossed-field technique Thomson had invented to study cathode rays. Assuming that (which turns out to be true), would the deflection of an alpha particle by a magnetic field be larger than, smaller than, or the same as the deflection of a cathode-ray particle by the same field? Explain.
An alpha particle (a bare helium nucleus with q=+2e) accelerates across a 100 V potential difference, starting from rest. What is the particle’s kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.
A newspaper delivery boy is riding his bicycle down the street at m/s. He can throw a paper at a speed of m/s. What is the paper’s speed relative to the ground if he throws the paper (a) forward, (b) backward, and (c) to the side?
Explain why the observation of alpha particles scattered at very large angles led Rutherford to reject Thomson’s model of the atom and to propose a nuclear model.
An oil droplets with excess electrons is observed between two parallel electrodes spaced 12 mm apart. The droplet hangs motionless when the upper electrode is 25V more positive than the lower electrode. The density of the oil is 860 kg/m3. What is the radius of the droplet?
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