10 Question-Answer on electromagnetic spectrum 1. The wavelength of X-rays is of the order of: (a) 1 metre (b) 1 cm (c) 1 micron (d) 1 angstrom Ans: ( d) 2. Which of the following is the largest wave? (a) X-rays (b) ϒ – rays (c) Microwaves (d) Radio waves Ans : (d) 3. In which of the following, emission of electrons does not take place (a) Thermionic emission (b) X-ray emission (c) Photoelectric emission (d) Secondary emission Ans: ( b) 4. Molybedenum is used as a target element for the production of X-xrays because it is (a) Light and can easily deflect electrons (b) Light and can ...
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