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Chapter 24: Q15PE (page 888)
Determine the amount of time it takes for X-rays of frequencyto travel (a) 1 mm and (b) 1 cm
b. The time taken for 1cm is .
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Show that, when SI units for \({\mu _0}\) and \({\varepsilon _0}\) are entered, the units given by the right-hand side of the equation in the problem above are \(m/s\).
Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to the Moon. The sound spoken by the person on Earth was transformed into a radio signal sent to the Moon and transformed back into sound on a speaker inside the astronaut's space suit. This sound was picked up by the microphone in the space suit (intended for the astronaut's voice) and sent back to Earth as a radio echo of sorts. If the round-trip time was 2.60 s , what was the approximate distance to the Moon, neglecting any delays in the electronics?
Illustrate that the size of details of an object that can be detected with electromagnetic waves is related to their wavelength, by comparing details observable with two different types (for example, radar and visible light or infrared and X-rays).
(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. (b) Which frequency would produce smaller hot spots in foods due to interference effects?
(a) What is the wavelength of 100 MHz radio waves used in an MRI unit? (b) If the frequencies are swept over a range centered on 100MHz , what is the range of wavelengths broadcast?
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