How Your Phone Finds You
Lee el texto en inglés, parte por parte, y responde cada pregunta. Toca una palabra con línea punteada para ver su traducción. Abajo está el vocabulario completo en español.
Open a map on your phone, and a blue dot shows where you are. The phone does not guess. It listens to satellites flying about 20,000 kilometers above the Earth.
1. How does your phone know where you are?
- AIt guesses
- BIt listens to satellites
- CIt asks other phones
Ver la respuesta
B. It listens to satellites
It listens to satellites high above the Earth.
La prueba en el texto: It listens to satellites flying about 20,000 kilometers above the Earth
Each satellite carries a very exact clock and sends out the time, again and again. The signal travels at the speed of light, but it still takes a tiny moment to arrive. Your phone measures that moment.
2. What does each satellite send out?
- AThe time
- BPhotos of the Earth
- CThe weather
Ver la respuesta
A. The time
Each satellite sends out the time, again and again.
La prueba en el texto: sends out the time, again and again
From that moment, the phone works out how far away each satellite is. It needs signals from at least four satellites. Then it can find your place, usually within a few meters.
3. True or false? The phone needs only one satellite to find you.
- ATrue (Verdadero)
- BFalse (Falso)
Ver la respuesta
B. False (Falso)
It needs signals from at least four satellites.
La prueba en el texto: It needs signals from at least four satellites
There is one strange problem. Up there, time runs a tiny bit faster than on the ground, as Einstein predicted. Without a correction, your blue dot would be wrong by about 10 kilometers after one day.
4. What is the strange problem?
- AThe satellites move too slowly
- BClouds block the signal
- CTime runs a bit faster up there
Ver la respuesta
C. Time runs a bit faster up there
Up there, time runs a tiny bit faster than on the ground.
La prueba en el texto: time runs a tiny bit faster than on the ground
Vocabulario en español
| Inglés | Español | Significado en inglés |
|---|---|---|
| guess | adivina | give an answer without really knowing |
| measures | mide | finds the size or amount of something |
| works out | calcula | finds the answer by thinking or counting |
| within | a menos de | not more than |
| tiny | muy pequeño | very, very small |
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Escribe una frase en inglés: In one sentence: how does your phone know where you are?
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