Light waves of frequency 6 . 0 × 10 14 Hz have a wavelength of 3 . 75 × 10 - 7 m in water. What is their speed in water?

Given: Frequency of the wave f = 6 . 0 × 10 14 Hz , Wavelength λ = 3 . 75 × 10 - 7 m For any given wave, the product of wavelength and frequency gives the velocity. It is mathematically given by wave velocity formula written as- V = f × λ Where, V is the velocity of the wave measure using ms - 1 . f is the frequency of the wave measured using Hz . λ is the wavelength of the wave measured using m . By substituting the above values in the formula we get, V = 6 × 10 14 × 3 . 75 × 10 - 7 = 2 . 25 × 10 8 ms - 1 .

E M B I B E

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 14 - Properties of Waves>End-of-chapter questions>Q 6

HARD

Upper Secondary: IGCSE

IMPORTANT

Earn 100

Look at the wave shown. The horizontal and vertical scales are in cm.

On graph paper. With the same labelled and numbered axes as here, sketch a wave having half this amplitude and twice this wavelength.

Important Questions on Properties of Waves

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 14 - Properties of Waves>End-of-chapter questions>Q 7

Copy and complete the diagram to show how plane waves are reflected by a straight barrier placed at an angle to their direction of travel.
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