Study Guide 4, Self Test 2

© Department of Physics, University of Guelph.

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1. Arrange the following in order of decreasing wavelength:
red light, radio waves, infrared, X-rays, ultraviolet, blue light.

2. radio station CJOY (Guelph) is located at 1460 on the AM band; this means that CJOY broadcasts at 1460 kHz (1.46X106 Hz). What is:

(a) the wavelength of a CJOY radiowave, and
(b) the energy of a CJOY photon?

3. Typical X-rays have a wavelength of 0.01 nm. What is the energy of one of the X-ray photons. How many CJOY photons are required to equal the energy of one of these X-ray photons?

4. What must be the speed of a neutron (m = 1.67X10-27 kg) to have the same wavelength as the X-rays in question 3?

5. An electron (me = 9.11X10-31 kg) has a kinetic energy of 6.00X10-22J. What is the energy of a photon which has the same wavelength as that of the electron?

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