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Matter In Our Surroundings

Question
CBSEENSC9005696
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During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station ? The signal travels at the speed of light, that is, 3 × 108 ms-1.

Solution

Here we have,
time, t = 5 minutes = 300 s,
Speed with which the signal is travelling, v = 3 × 108 ms-1

Now, using the formula, we get

Distance of spaceship, s = vt
                                    = 3 × 108 × 300
                                    = 9 × 1010 m.

Some More Questions From Matter In Our Surroundings Chapter

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

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