A LevelPhysicsEdexcelExam Questions5. Waves & Particle Nature of LightWaves, Electrons & Photons

Waves, Electrons & Photons (Edexcel A Level Physics)

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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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