EM waves
Ultra Violet
What is the speed of sound in air at room temperature (20°C)?
The speed of sound in air at 20°C is approximately 343 m/s. (This value can vary slightly depending on factors like air pressure and humidity.)
What is the human hearing range?
20Hz - 20kHz
A cyclist cycles at 3m/s for 3 minutes. How far have they travelled in 3 mintues?
540m
An object has a mass of 5 kg and is subjected to an acceleration of 2 m/s². What is the force acting on the object?
The longest wavelengths are seen as what colour on the visible light spectrum?
Red
If the frequency of a sound wave increases, what happens to its wavelength, assuming the speed of sound remains constant?
What is the frequency range of seismic waves?
This phenomenon occurs when light changes direction as it passes from one medium to another, causing objects to appear displaced when viewed from different angles.
Refraction
A wave has a frequency of 50 Hz and a wavelength of 2 meters. What is the wave's speed?
100 m/s
This type of EM wave is used for sterilizing equipment and for cancer treatments.
gamma rays
A sound wave travels through a medium with a speed of 340 m/s. If the wavelength of the sound wave is 2 meters, what is the frequency of the sound wave?
170Hz
What is the frequency range of the waves that bats produce to use echolocation?
greater than 20kHz
What is Newton's First Law of Motion?
This law states that an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.
A car with a mass of 1,200 kg accelerates from 0 to 20 m/s in 10 seconds. What is the force required to accelerate the car?
2400N
What is the difference between ionizing and non-ionizing radiation, and which types of EM waves fall into each category?
Ionizing radiation has enough energy to remove electrons from atoms
ionizing - UV, X rays, Gamma rays
This phenomenon occurs when sound waves are reflected off a surface, causing the sound to return to its source, and is commonly used in sonar technology.
echo
What is the frequency range of a radiowave?
thousands of metres to 30 cm.
This force occurs when an object is moving through a fluid, such as air or water, and is in the opposite direction of the object's motion
drag
A 10 kg object is acted upon by two forces: 30 N to the right and 20 N to the left. What is the object's acceleration?
1 m/s2
Why is the sky blue
Rayleigh scattering - Blue light is scattered more than other colors because it has a shorter wavelength and is more easily deflected by the particles in the air.
This technique uses high-frequency sound waves to detect internal structures by measuring the time it takes for sound waves to bounce back after hitting tissues of varying densities, often used for diagnostic purposes.
Ultrasound imaging
What is the wavelength range of a gamma ray?
less than 10 picometers (1×10−11 m)
This type of force is responsible for keeping an object moving in a circular path, acting perpendicular to the object's velocity.
centripetal force
A light wave travels through a vacuum with a speed of 3.0×108 m If its frequency is 5.0 TeraHertz, what is the wavelength of the light wave?
600nm