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

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

This relation is due to the electromagnetic spectrum, where higher frequency waves (like gamma rays) are more dangerous.

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

$$λ = \frac{v}{f}$$

where:

• v is the speed of the wave (3.0 x 10⁸ m/s)
• f is the frequency (1.5 x 10⁸ Hz)

Plugging in the values gives:

$$λ = \frac{3.0 \times 10^8 \, \text{m/s}}{1.5 \times 10^8 \, \text{Hz}} = 2.0 \, \text{m}$$