International A LevelPhysicsEdexcelExam Questions2. Waves & ElectricityWaves, Electrons & Photons

Waves, Electrons & Photons (Edexcel International A Level Physics)

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The wavefront diagrams show consecutive waves approaching gaps of different sizes.

q9-wph12-02-oct-2021-edexcel-int-as-and-a-level-phy

The wavefronts diffract as they pass through each gap.

In which diagram will the diffracted wavefronts not be semicircular?

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    2
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    A student determines the wavelength of the light emitted by a laser. She uses the laser, a diffraction grating and a screen.

    Which of the following measurements is not required?

    • the distance from the diffraction grating to the screen

    • the distance from the central maximum to the first order maximum

    • the distance from the laser to the diffraction grating

    • the distance between the slits in the diffraction grating

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    3
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    A pulse of ultrasound is emitted from the bottom of a boat. The ultrasound reflects from the seabed and is detected at the bottom of the boat after time t. The depth d of water under the boat is shown.

    q9-wph12-02-june-2021-edexcel-int-as-a-level-phy

    The ultrasound has a frequency f and travels at a speed v in the seawater.

    Which of the following can be used to calculate d?

    • d equals v t

    • d equals v over f

    • d equals fraction numerator v t over denominator 2 end fraction

    • d equals fraction numerator v over denominator 2 f end fraction

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    1
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    A moving electron has a de Broglie wavelength of 656 nm.

    Which of the following could be used to determine the speed of the electron?

    • fraction numerator 6.63 space cross times 10 to the power of negative 34 end exponent over denominator open parentheses 656 cross times 10 to the power of negative 9 end exponent close parentheses open parentheses 9.11 cross times 10 to the power of negative 31 end exponent close parentheses end fraction

    • fraction numerator open parentheses 656 cross times 10 to the power of negative 9 end exponent close parentheses open parentheses 9.11 cross times 10 to the power of negative 31 end exponent close parentheses over denominator 6.63 space cross times 10 to the power of negative 34 end exponent end fraction

    • fraction numerator open parentheses 656 cross times 10 to the power of negative 9 end exponent close parentheses open parentheses 6.63 space cross times 10 to the power of negative 34 end exponent close parentheses over denominator 9.11 cross times 10 to the power of negative 31 end exponent end fraction

    • fraction numerator 9.11 cross times 10 to the power of negative 31 end exponent over denominator open parentheses 656 cross times 10 to the power of negative 9 end exponent close parentheses open parentheses 6.63 space cross times 10 to the power of negative 34 end exponent close parentheses end fraction

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    2
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    The de Broglie wavelength for a moving electron is 5.47 × 10–10 m.

    Which of the following expressions gives the speed of the electron in m s–1?

    • fraction numerator open parentheses 6.63 space cross times space 10 to the power of negative 34 end exponent close parentheses over denominator open parentheses 9.11 space cross times space 10 to the power of negative 31 end exponent close parentheses open parentheses 5.47 space cross times 10 to the power of negative 10 end exponent close parentheses end fraction

    • fraction numerator open parentheses 6.63 space cross times space 10 to the power of negative 34 end exponent close parentheses over denominator open parentheses 1.60 space cross times space 10 to the power of negative 19 end exponent close parentheses open parentheses 5.47 space cross times 10 to the power of negative 10 end exponent close parentheses end fraction

    • fraction numerator open parentheses 9.11 space cross times space 10 to the power of negative 31 end exponent close parentheses open parentheses 5.47 space cross times 10 to the power of negative 10 end exponent close parentheses over denominator open parentheses 6.63 space cross times space 10 to the power of negative 34 end exponent close parentheses end fraction

    • fraction numerator open parentheses 1.60 space cross times space 10 to the power of negative 19 end exponent close parentheses open parentheses 5.47 space cross times 10 to the power of negative 10 end exponent close parentheses over denominator open parentheses 6.63 space cross times space 10 to the power of negative 34 end exponent close parentheses end fraction

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    3
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    The diagram represents an arrangement to demonstrate electron diffraction.

    q5-wph14-04-june-2021-edexcel-int-as-and-a-level-phy

    A beam of electrons is directed at a sample of crystalline material.

    Which of the following single changes would decrease the angle of diffraction θ?

    • decrease the distance between the sample and the screen

    • increase the anode potential V

    • increase the current in the filament

    • use a sample with a smaller atomic spacing

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