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3 (a) Complete the sentences by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2011 - Paper 1

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3 (a) Complete the sentences by putting a cross (✗) in the box next to your answer. (i) All electromagnetic waves are ☐ A longitudinal and have the same amplitude ... show full transcript

Worked Solution & Example Answer:3 (a) Complete the sentences by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2011 - Paper 1

Step 1

Complete the sentences by putting a cross (✗) in the box next to your answer.

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Answer

For part (i):

The correct answer is D: 'transverse and have the same speed in a vacuum.'

For part (ii):

The correct answer is B: 'frequency increases and wavelength decreases.'

Step 2

Calculate their wavelength.

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Answer

To find the wavelength ( \lambda), we can use the formula:

λ=vf\lambda = \frac{v}{f}

where:

  • v=3.0×108v = 3.0 \times 10^8 m/s (speed of microwaves)
  • f=1.5×109f = 1.5 \times 10^9 Hz (frequency)

Substituting the values in:

λ=3.0×1081.5×109=0.2 m\lambda = \frac{3.0 \times 10^8}{1.5 \times 10^9} = 0.2 \text{ m}

Thus, the wavelength is 0.2 m.

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