Exam code: 8PH0
Ultrasound can be used to investigate the structure of organs of the human body using the pulse-echo technique.
The level of detail obtained depends on the wavelength and the length of the pulses.
Which line of the table shows a change to wavelength and a change to pulse length that would each improve the level of detail?
| Wavelength | Pulse length |
A | decrease | decrease |
B | increase | decrease |
C | decrease | increase |
D | increase | increase |
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A monochromatic beam of light of wavelength λ from a laser is directed at a diffraction grating of line spacing d.
A student calculates the value of d/λ in order to determine the expected number of visible maxima.
The calculated value of d/λ is 4.7
How many maxima are visible?
4
5
9
11
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An electron and a proton are travelling at the same velocity.
The electron has a mass and a de Broglie wavelength .
The proton has a mass .
Which of the following gives the de Broglie wavelength of the proton?
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When laser light of wavelength is directed towards a diffraction grating, a diffraction pattern is observed on a screen. The position of a second-order maximum on the screen is shown in the diagram.
Which of the following calculations should be used to determine the number of lines per mm of the grating?
where
where
where
where
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