iGCSE Physics (0625) 3.2.1 Reflection of light Paper 4 -Exam Style Questions- New Syllabus
Question
(a) State the name of the reflection of a sound wave or ultrasound wave
(b) Fig. 5.1 shows an ultrasound wave being used to scan an internal organ of a human body.
The ultrasound wave has a frequency of 2.0 MHz and passes through human tissue at a speed of 1500 m / s.
Calculate the wavelength of the ultrasound wave in human tissue.
wavelength =
(c) Fig. 5.2 shows crests of a wave from a point source S approaching a straight barrier.
(i) On Fig. 5.2, indicate and label one wavelength.
(ii) On Fig. 5.2, draw three crests of the wave reflected from the barrier.
Answer/Explanation
Answer:
(a) echo (b) (λ=) 7.5 × \(10^{-4}\) m
(λ=) v / f OR v = fλ in any form
(λ=) 1.5 × \(10^3\) / 2 × \(10^6\)
(c)(i),(ii) labelled wavelength of incident wave
3 part circles to the left of the barrier and centred to right of the barrier
wavelengths of reflected and incident waves same