What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth. A microwave has a wavelength of 12.5 cm. The speed of microwaves through space is 3.0 × 10^8 m/s. Calculate the frequency of the microwave. Use the Physics Equations Sheet. Give your answer in standard form. The Hubble Space Telescope can detect visible light from distant galaxies. The visible light spectra from stars and galaxies include dark lines at specific wavelengths. Figure 16 shows the visible light spectra from the Sun and two galaxies. Explain what conclusions can be made about galaxies A and B.

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What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth - AQA - GCSE Physics - Question 6 - 2023 - Paper 2

Question 6

What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth. A microwave has a wavelength of 12.5 cm. The spe... show full transcript

Worked Solution & Example Answer:What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth - AQA - GCSE Physics - Question 6 - 2023 - Paper 2

Step 1

What name is given to objects that orbit a planet?

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Answer

The term used for objects that orbit a planet is satellite. This can include natural satellites like moons.

Step 2

Calculate the frequency of the microwave.

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Answer

To calculate the frequency (

f) of the microwave, we can use the formula:

$f = \frac{v}{\lambda}$

where:

v is the speed of the waves (3.0 × 10^8 m/s)
λ (lambda) is the wavelength (12.5 cm = 0.125 m)

Substituting the values, we have:

$f = \frac{3.0 \times 10^8 \, \text{m/s}}{0.125 \, \text{m}} = 2.4 \times 10^9 \, \text{Hz}$

Thus, the frequency of the microwave in standard form is 2.4 × 10^9 Hz.

Step 3

Explain what conclusions can be made about galaxies A and B.

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Answer

From Figure 16, we can observe:

Galaxy A has a greater red shift compared to Galaxy B.
This implies that Galaxy A is moving away from us at a faster speed than Galaxy B.
Since Galaxy A is also further away from us, we can conclude that both galaxies A and B are receding from the Earth, consistent with the expansion of the universe.

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What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth - AQA - GCSE Physics - Question 6 - 2023 - Paper 2

Worked Solution & Example Answer:What name is given to objects that orbit a planet? A space telescope uses microwaves to communicate with the Earth - AQA - GCSE Physics - Question 6 - 2023 - Paper 2

What name is given to objects that orbit a planet?

Calculate the frequency of the microwave.

Explain what conclusions can be made about galaxies A and B.

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