Contoh Soal Understanding Factual Reports (Objects or Things)
Contoh Soal Understanding Factual Reports (Objects or Things) - Do you like listening to music?
What devices do you use to play music?
How do you usually play music? Loud or low?
Music is probably everyone’s favorite sound. Nowadays we can listen to music not only from radio but also from various music players. If you want to hear music out loud, you have to use speakers. Did you know that there are various types of speakers? To find out read the following text.
Reading Text 1
Electro-dynamic Loudspeaker
Audio speakers were known since a long time ago, when Ernst Siemens invented the first loudspeaker back in 1877. The modern audio speaker – or the most common type of speaker in the world today – is called electro-dynamic loudspeaker, or simply loudspeaker. This device uses an electromagnetic coil and diaphragm to create sound.
Speaker is aimed and designed to produce a specific frequency range. There are variations on how to build the speaker. Electromagnet is used by the modern speaker to turn various strengths of electric signals into movements. The coil of copper wire, then moves along with the movement of the magnet. The coil is connected to a cardboard or paper or seemed like cone-shaped vinyl. What is the cone actually? It is a diaphragm that vibrates along with the coil. Sound is created and amplified by the diaphragm.
Loudspeaker today comes in various types in order to produce a quality sound for a given frequency range. There is Tweeter to produce all high end frequencies from 2kHz to 20 kHz, Mid-range speaker to cover most human voice along with most instruments from 300 to 5kHz, Woofer to produce 40 to 1kHz, and Subwoofer to produce very low frequencies from 20 to 200 Hz. Subwoofers also produce sound waves that penetrate walls easily. Subwoofers were developed in the 1960s.
In Physics class you learn about types of waves such as electrical waves and sound waves. Sound waves have several characteristics that you can read in the following text.
Sound waves.
Sound waves.
Reading Text 2
Sound Wave
A sound wave is a special type of wave that human ears can detect. The sound waves have special characteristics that make them unique. Vibration is the source of sound and it triggers a disturbance in the molecules that exist around the source. The wave's energy is transferred from molecule to molecule within the medium.
Sound waves are mechanical waves. They travel through a medium. We normally hear a sound through air. However, sound waves can travel to other mediums such as water, wood and many other substances. Nevertheless, sound cannot travel through a vacuum like other space.
Another typical characteristic of sound waves is that they are longitudinal. It means, the disturbance of the wave moves in the same way as the wave's motion. Along with the vibration of the molecules and, they transfer energy to each other causing a wave that moves in similar direction of the vibration. Longitudinal wave is where the molecules move in a specific movement from left to right and making both the wave and the disturbance to move in the same direction. In some areas of the wave, the molecules are bunched together. This is named compression. In other areas, the molecules are spread out, referred as rarefaction.
Sound waves can also be pressure waves. This happens when the compressions and rarefactions that move through sound waves have different pressures. The compressions are areas of high pressure while the rarefactions are areas of low pressure.
Do you understand?
Now listen to the provided audio and try your best to answer the following questions based on the speaker’s explanation.
a. What is sound?
b. What is frequency?
c. What is measured by decibels?
d. Where is ‘bel’ in ‘decibels’ is taken from?
e. What range of audio frequency human can hear?
b. What is frequency?
c. What is measured by decibels?
d. Where is ‘bel’ in ‘decibels’ is taken from?
e. What range of audio frequency human can hear?
Answer :
a. Energy passing through gas or liquid medium
b. A measure of sound
c. The loudness of the speakers
d. Alexander Graham Bell
e. 20 – 20000 Hz
b. A measure of sound
c. The loudness of the speakers
d. Alexander Graham Bell
e. 20 – 20000 Hz
S1
The function of seismograph is ....
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The second paragraph mainly talks about ....
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The option that is NOT the use of modern seismograph: ....
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The following audio is for question 4 to 6.
The word alphabet comes from ....
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The following audio is for question 4 to 6.
The Greek letters are popular as ....
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Magnets were originally made from ....
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The following audio is for question 4 to 6.
There are … Greek letters which were taken from Phoenician script.
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Two magnets can attract each other when....
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Wood is called non-magnetic substance because ....
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The conclusion of the last paragraph is ....