Sound Wave Properties

• Sound waves and their properties are covered

Healthy Habits for Positive Wellbeing

• To improve wellbeing while social distancing, it's important to maintain healthy habits
• Engaging in fun activities like watching comedies, playing games, or dancing can improve wellbeing
• Limit exposure to social media and sedentary online activities
• Practicing mindfulness through calming music or deep breathing can reduce uncertainty and feeling overwhelmed
• Establish quiet times in the day with activities like coloring, puzzles, or crosswords
• Take regular breaks and spend time with pets or in the garden
• Get outside at least once per day and stay active by stretching and jumping around
• Eat a diet rich in fruits, vegetables, whole grains, and proteins
• Stay hydrated and unleash creativity in the kitchen
• Connect with friends and family through video calls to see a face and hear a voice
• Write letters to grandparents or extended family
• Help with household chores as being part of household is important
• Do kind things for others and contact those you're grateful for and express gratitude
• Organize tasks for the next day to look forward
• Maintain a consistent sleep routine by going to bed and waking up at the same time each day
• Aim for 8-10 hours of sleep each night
• Turn off screens 30-60 minutes before bed
• Keep electronic devices in another room while you sleep
• Good sleep is energizing
• Improves focus and motivation

Sound Waves Experiment

• Tuning forks which demonstrate sound waves and their use
• Tuning forks of different frequencies are used by students to experiment with sound wave production
• Tuning forks for healing is gentle yet powerful modality to treat the mind, body, and soul, and to restore inner balance and health and has long-term benefits

Sound Wave Info

• Vibrating tuning fork prongs set nearby air molecules in motion
• The movement of molecules creates regions of high molecular density and air pressure, called compression
• Prongs moving to the left causes the molecules to the right to spread apart
• Lower density and pressure regions are called rarefaction
• In sound waves, air molecule vibrations are parallel to the wave's direction, classifying them as longitudinal
• Vibrating objects produce longitudinal waves
• Sound travels faster through the ground
• Sound speed is the same for all audible frequencies because the medium is the same

Speed of Sound

• When a sound wave goes from air to water, frequency is unchanged
• A louder sound indicates increasing intensity
• Longitudinal sound waves are when air molecules vibrate in the direction of wave motion
• Varying audible sound wave frequency affects whether they are perceived as high or low (known as the pitch)
• Increasing a sound wave's frequency causes the pitch to rise
• Frequency is measurable and objective
• Pitch depends on the listener
• Pitch depends not only on frequency but also on other factors, such as background noise and loudness
• Frequency is the rate of particle vibration, pitch is the quality of sounds
• Speed of sound depends on the medium's temperature, and increasing temperature increases the frequency of gas particles colliding
• Gas disturbance spreads faster
• Liquids and solids are less affected by temperature due to closeness of the particles
• Sound is faster through water than air because the molecules are closer together, leading to faster spread of vibrations
• Sound waves travel faster through water because the molecules of water are closer together and, as a result, can spread vibrations more quickly
• The factors that speed of sound depends on are state of matter, temperature, stiffness & density
• The elasticity of a medium is a major factor in determining sound speed

Sound in different mediums

• The sound range perceptible to humans is 20-20,000 hertz (Hz)
• Infrasonic, audible, and ultrasonic sounds have different frequncies
• Dogs detect sounds of higher frequency than humans.
• Warm water molecules have more kinetic energy and move faster than cold
• Sound better in warmer waters

Doppler Effect

• Doppler effect
• Although a siren’s frequency is constant, the observer in front of an ambulance (Observer A) hears wave fronts more often than if stationary
• The air's sound speed is unchanged because speed depends only on air temperature
• When an ambulance passes, the siren’s pitch drops
• Distant spherical wave fronts approximate parallel planes or plane waves
• High-frequency echolocation waves can detect smaller objects
• If a dolphin swims towards a fish and the frequency of reflected waves is higher, the dolphin is catching up to the fish