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science
physics?
| Question | Answer |
|---|---|
| What is an independant variable | One thing you change in an experiment to see its effect |
| What is a dependant variable | Something you meausre |
| What is conduction | Conduction transfers heat through direct contact. Particles vibrate and pass on energy to neighbouring particles (mainly in solids). |
| What is convection | Convection transfers heat by the movement of particles in fluids (liquids or gases). Warm particles rise and cooler ones sink, creating a current. |
| What is radiation | Radiation transfers energy as electromagnetic waves and does not need particles. These waves carry thermal energy when it reaches an object, the energy is then absorbed and increases the object's temperature. |
| What are the 7 types of energies on the electromagnetic spectrum, and what is a common use for them (in order) | Radiowaves - used for broadcasting TV (low energy long wavelength), Microwaves - used in microwaves to heat food, Infared - used in thermal imaging cameras, Visible Light - allows us to see colours |
| What are the 7 types of energies on the electromagnetic spectrum, and what is a common use for them (continued) | Ultraviolet - used in tanning beds, X rays - used to view bones in a body, Gamma Rays - used to kill cancer cells (high energy short wavelength) |
| Explain the movement of particles within a longitudinal wave in relation to the movement of energy within the wave. | In a longitudinal wave, particles move back and forth in the same direction as the energy. E.g Sound waves |
| Explain the movement of particles within a transverse wave in relation to the movement of energy within the wave. | In a transverse wave, particles move up and down at right angles to the direction the energy travels. While the energy travels forward along the wave moving sideways through a medium (e.g., water waves, light). |
| What is wavelength | A wavelength is a full motion or it's the distance between two identical points on a wave. |
| What is frequency | A frequency is how many wavelengths in one second usually measured in Hz (Hertz). Frequency = wave speed / wavelength of a wave |
| What is amplitude | An amplitude is how far away is the wave from the x-axis either from the crest or trough |
| Identify the wavelength of a wave. | For transverse waves, it's crest to crest or trough to trough. For longitudinal waves, it's compression to compression or rarefaction to rarefaction. |
| How to find sound and amplitude | The louder the sound the higher the amplitude, the quieter the sound the lower the amplitude |
| How to find wavelength and pitch | Short wavelength=high pitch, long wavelength=low pitch |
| Compare the three processes of conduction, convection and radiation in terms of their movement of particles and energy. | Conduction, Particles stay in place and pass energy by vibrating. Only energy moves. Convection, Particles themselves move and carry energy with them in a fluid. Radiation, No particles are needed. Energy travels as waves through air or even a vacuum. |
| What is pitch | How high or low a sound is, depending on its frequency. Directly related to the frequency of a sound wave. |
| What are photons | Particles of light that carry energy in electromagnetic radiation. |
| Identify the order of colours within the visible light spectrum from slowest (least energy) to fastest (most energy): | Red (lowest energy, longest wavelength) Orange Yellow Green Blue Indigo Violet (highest energy, shortest wavelength) |
| Explain how sound travels through different media | Sound travels fastest in solids because the particles are tightly packed. But it travels slower in liquids, as particles are less close. It travels slowest in gases, because particles are far apart and don't pass vibrations easily. |
| Describe and explain how the different forms of electromagnetic radiation can be used for different purposes due to the characteristics of frequency and energy | Radiation types vary based on photon energy. EM radiation forms have different frequencies and energies, influencing their use and interaction with matter. The EM spectrum spans from low-frequency radio waves to high-frequency gamma rays. |
Created by:
A-c-h
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