Grade 11 Physics Midyear Exam
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Questions and Answers

What type of wave is sound classified as?

  • Transverse wave
  • Electromagnetic wave
  • Static wave
  • Mechanical wave (correct)

    • In a sound wave, what physical characteristic corresponds to the loudness of the sound?

  • Amplitude (correct)
  • Wave speed
  • Wavelength
  • Frequency

    • What happens to the pitch of a sound wave as its frequency increases?

  • The pitch increases (correct)
  • The pitch remains the same
  • The pitch decreases
  • The pitch fluctuates randomly

    • What is the primary factor that causes the Doppler effect?

    <p>Relative motion between the source and the observer</p> Signup and view all the answers

    Which of the following statements about compressions and rarefactions in a sound wave is true?

    <p>Compressions correspond to crests in a sine curve</p> Signup and view all the answers

    Which characteristic of sound waves best determines their pitch?

    <p>Frequency</p> Signup and view all the answers

    If two sound waves have the same frequency but different amplitudes, what can be concluded about their loudness?

    <p>The wave with higher amplitude will be louder</p> Signup and view all the answers

    During constructive interference, what is the expected outcome on the sound waves?

    <p>The sound waves will amplify each other</p> Signup and view all the answers

    What is the length of the string if the wavelength is 1.2 m and the harmonic number is 3?

    <p>1.8 m</p> Signup and view all the answers

    Which of the following describes points of maximum amplitude on a standing wave?

    <p>Antinodes</p> Signup and view all the answers

    What would be the wavelength that does NOT produce standing waves on a guitar string of length 1.20 m?

    <p>1.50 m</p> Signup and view all the answers

    How many wavelengths of a wave fit in a string vibrating at its fundamental frequency?

    <p>1</p> Signup and view all the answers

    If a pipe is closed at one end and it resonates at a fundamental frequency of 240 Hz, what is the frequency of the next harmonic?

    <p>720 Hz</p> Signup and view all the answers

    What is the length of a guitar string if its second harmonic has a frequency of 165 Hz and the wave speed is 120 m/s?

    <p>0.73 m</p> Signup and view all the answers

    What is the formula used to determine the frequency of a string vibrating at its nth harmonic?

    <p>$f_n = \frac{n \cdot v}{L}$</p> Signup and view all the answers

    Which phenomenon occurs when waves coincide and amplify or reduce the amplitude?

    <p>Interference</p> Signup and view all the answers

    What is the wavelength of the first harmonic for a string of length L?

    <p>$2L$</p> Signup and view all the answers

    What does each integral multiple of the fundamental frequency represent?

    <p>A harmonic</p> Signup and view all the answers

    For an open-ended pipe, what are the permissible harmonic numbers?

    <p>All integers</p> Signup and view all the answers

    What formula can be used to calculate the frequency of the n-th harmonic in a string?

    <p>$f_n = n imes rac{v}{2L}$</p> Signup and view all the answers

    What harmonic is associated with the lowest frequency of vibration on a string?

    <p>First harmonic</p> Signup and view all the answers

    If a string vibrates with a fundamental frequency of 200 Hz, what is the frequency of the second harmonic?

    <p>400 Hz</p> Signup and view all the answers

    For a string vibrating in the third harmonic mode, how many nodes are present?

    <p>3</p> Signup and view all the answers

    In a closed pipe, which harmonic frequencies are present?

    <p>n = 1, 3, 5, ...</p> Signup and view all the answers

    What is the angle of incidence if the angle of reflection is 30 degrees?

    <p>30 degrees</p> Signup and view all the answers

    What type of reflection occurs when parallel light rays hit a rough surface?

    <p>Diffuse reflection</p> Signup and view all the answers

    What characterizes a virtual image formed by a plane mirror?

    <p>It cannot be projected onto a screen</p> Signup and view all the answers

    Calculate the wavelength of the FM radio band at 94.7 MHz. What is the result?

    <p>3.2 m</p> Signup and view all the answers

    If the wavelength of highly energetic ultraviolet radiation is 125 nm, what is its frequency?

    <p>$2.4 \times 10^{15} Hz$</p> Signup and view all the answers

    What happens to the direction of electromagnetic waves when they reflect off a plane mirror?

    <p>They reverse direction</p> Signup and view all the answers

    Which statement is true regarding the angle of incidence and the angle of reflection?

    <p>They are always equal</p> Signup and view all the answers

    What characteristic defines a specular reflection?

    <p>It reflects light rays in parallel directions</p> Signup and view all the answers

    What is the relationship between the object distance and the image distance in a plane mirror?

    <p>Image distance is negative of the object distance.</p> Signup and view all the answers

    Which statement about the heights of the object and image in a plane mirror is true?

    <p>The image height is equal to the object height.</p> Signup and view all the answers

    If an object is located 15 cm in front of a plane mirror, what will be the distance of the image from the mirror?

    <p>15 cm in front of the mirror.</p> Signup and view all the answers

    What type of image is formed by a plane mirror?

    <p>Virtual and upright.</p> Signup and view all the answers

    What occurs when light strikes a plane mirror at an angle of 60° to the normal?

    <p>The angle of reflection will also be 60° to the normal.</p> Signup and view all the answers

    Which of the following statements about the image formed by a plane mirror is incorrect?

    <p>The image distance is negative.</p> Signup and view all the answers

    What happens to the orientation of an object viewed in a plane mirror?

    <p>It is flipped horizontally.</p> Signup and view all the answers

    If a plane mirror is tilted, how does it affect the image seen in the mirror?

    <p>The image will change position and orientation.</p> Signup and view all the answers

    What happens to the energy of a wave when its amplitude increases?

    <p>It increases as amplitude rises.</p> Signup and view all the answers

    If wave amplitude is shown by the letter Z and wavelength is shown by the letter X, which option is correct?

    <p>Wave's amplitude is Z, wavelength is X.</p> Signup and view all the answers

    What is the unit for frequency, defined as 'cycles per second'?

    <p>hertz (Hz)</p> Signup and view all the answers

    Which number value corresponds to the wavelength if it is indicated as 10 cm in a graph?

    <p>10</p> Signup and view all the answers

    Which wave pattern likely has the lowest frequency?

    <p>Wave pattern 4</p> Signup and view all the answers

    If a wave's frequency is given as 25.0 Hz, what is the correct calculation for its period?

    <p>0.04 s</p> Signup and view all the answers

    What is the relationship between wave speed, frequency, and wavelength?

    <p>Wave speed is equal to frequency multiplied by wavelength.</p> Signup and view all the answers

    If a wave's amplitude is shown by 18 cm and the calculation for it is correct, what should the amplitude be?

    <p>18 cm</p> Signup and view all the answers

    Study Notes

    Grade 11 Physics Midyear Exam

    • Exam date: Wednesday, December 11, 2024
    • Total marks: 30
    • Sections:
      • Section 1: Multiple-choice questions (MCQ) - 20 questions, 1 mark each
      • Section 2: Longer questions (calculations + writing) - 5 questions, 10 marks total
    • Topics covered:
      • Waves:
        • Hooke's Law
        • Simple pendulum
        • Characteristics of waves
        • Types of waves and speed of waves
        • Interference
      • Sound:
        • Characteristics of sound waves
        • Doppler effect
        • Standing waves and harmonics
      • Light:
        • Electromagnetic waves
        • Reflection off a plane mirror

    Resources

    • Study guide (provided)
    • Additional resources available on Toddle
    • Formula sheet provided in the exam paper

    Formula Sheet

    • List of formulas will be on the exam paper
    • Use correct SI units in calculations
    • SI units are listed (see below)

    SI Units

    • f: frequency (Hz)
    • T: period (s)
    • λ: wavelength (m)
    • F: force (N)
    • k: spring constant (N/m)
    • PE: potential energy (J)
    • x: displacement (m)
    • L: length (m)
    • v: speed (m/s)
    • c: speed of light (m/s)

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    Grade 11 Physics Midyear Exam PDF

    Description

    Prepare for your Grade 11 Physics Midyear Exam covering key topics such as waves, sound, and light. This exam includes both multiple-choice questions and longer calculation-based problems. Ensure you're ready with the provided study guide and formula sheet.

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