Questions and Answers
What is the wavelength of the electromagnetic waves produced by the transmitting antenna that operates at a frequency of 191.5 MHz?
1.56 m
Why must the elements of a receiving antenna be aligned horizontally?
To ensure they effectively receive the horizontally polarized electromagnetic waves.
What is the energy (in eV) of a photon with a wavelength of 565 nm?
2.20 eV
What is the energy of the photon produced by a HeNe laser with momentum 1.05 × 10–27 kgms–1?
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What type of light is emitted from a coherent source with a wavelength of 634 nm?
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Study Notes
Assessment Overview
- Assessment focuses on Light and Atoms for 2020 Physics curriculum.
- Duration: 105 minutes with a total of 100 marks.
- Key instruction: Allocate approximately 1 minute per mark for time management.
General Instructions
- Utilize provided equation sheet; no other notes allowed.
- Marks deducted for unclear solutions, incorrect significant figures, or missing definitions.
- Suggested use of diagrams where appropriate to enhance answers.
- Use black or blue pens for written work; sharp dark pencil for graphs and diagrams.
Electromagnetic Waves
- Channel 9 broadcasts from Mt Lofty at a frequency of 191.5 MHz.
- Relation between frequency and wavelength is crucial for calculating electromagnetic wave properties.
Antenna Alignment
- Horizontal alignment of antenna elements is necessary for optimal reception of horizontally polarized signals.
Photons and Energy
- Max Planck introduced concept of energy quantization via photons in 1900.
- Energy of a photon is directly proportional to its frequency.
- Photon energy can also be derived from wavelength and momentum.
Energy Calculations
- Required to calculate energy of a photon with given wavelength (e.g., 565 nm).
- Alternatively, calculate energy of a photon using momentum (e.g., 1.05 × 10⁻²⁷ kg·m/s).
Light Interference
- Light of wavelength 634 nm used in double slit experiment.
- Central maximum observed at point C; path difference critical for analyzing light behavior through slits.
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Description
This quiz assesses your knowledge of Light and Atoms as part of the 2020 Physics curriculum. It covers topics such as electromagnetic waves, photon energy, and antenna alignment. Be sure to manage your time effectively and refer to the provided equation sheet during the assessment.
