Sound
What is the measure of the loudness of sound?
Decibels
What do you call an object which is not a source of light? Luminous or non-luminous?
non-luminous.
What are the two poles of a magnet?
North pole and south pole.
What causes sound to produce?
Vibration
What do you call the material that allows some of the light to pass through it?
True or false. Law of magnetism states that like poles attract while unlike poles repel.
False.
If the musician makes the note lower, which property has been changed, loudness of pitch?
Pitch
Complete the sentence. In the law of reflection of light, the angle of incidence is ________ to the angle of reflection.
equal to
The two types of magnets are...
Permanent magnets and temporary magnets.
If a bird flaps its wings up and down 50 times in 20s, what is the frequency of its flapping?
The frequency of the bird's wing flapping is 2.5 flaps per second.
What do you call the phenomenon where light is bent?
Refraction
Give 3 uses of electromagnets.
Electric Motor
MRI
Metal Scrap
Maglev Trains
True or false. A sound with a higher frequency is louder than one with a lower frequency.
False. The loudness of a sound is not determined solely by its frequency.
Shadows are formed because...
Shadows are formed when an object blocks the path of light.
Why does the imaginary magnet inside the Earth is shown with a south pole at the top?
The convention of showing the south pole at the top when depicting the imaginary magnet inside the Earth is a simplification and visual aid to help understand and visualize the complex Earth's magnetic field.