International ASPhysicsEdexcelExam Questions2. Waves & ElectricityWaves, Electrons & Photons

Waves, Electrons & Photons (Edexcel International AS Physics): Exam Questions

Exam code: XPH11

43 mins10 questions

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Waves, Electrons & Photons

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1
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1 mark

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

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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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    1 mark

    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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    1 mark

    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=vt

    • d=vf

    • d=vt2

    • d=v2f

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    1
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    1 mark

    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?

    • 6.63 ×10−34(656×10−9)(9.11×10−31)

    • (656×10−9)(9.11×10−31)6.63 ×10−34

    • (656×10−9)(6.63 ×10−34)9.11×10−31

    • 9.11×10−31(656×10−9)(6.63 ×10−34)

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    2
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    1 mark

    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?

    • (6.63 × 10−34)(9.11 × 10−31)(5.47 ×10−10)

    • (6.63 × 10−34)(1.60 × 10−19)(5.47 ×10−10)

    • (9.11 × 10−31)(5.47 ×10−10)(6.63 × 10−34)

    • (1.60 × 10−19)(5.47 ×10−10)(6.63 × 10−34)

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    3
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    The diagram represents an arrangement to demonstrate electron diffraction.

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    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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