Quesiton
Fig. 8.1 represents a travelling wave at an instant in time.
(a) (i) Determine the amplitude of the wave.
amplitude = ………………………………………….. cm
(ii) Determine the wavelength of the wave.
wavelength = ………………………………………….. cm
(iii) It takes 2.0 s for a source to emit the wave shown in Fig. 8.1.
Calculate the frequency of the wave.
frequency = …………………………………………… Hz
(b) Fig. 8.2 shows the main regions of the electromagnetic spectrum.
(i) Two of the regions are not labelled.
Add the correct label to each of the unlabelled regions by writing in each box.
(ii) Describe one use of γ-rays.
Answer/Explanation
Answer:
(a)
(i) (amplitude =) 0.9 (cm)
(ii) (wavelength =) 112 ÷ 8
(wavelength =) 14 (cm)
(iii) (frequency =) 8 ÷ 2
(frequency =) (Hz)
(b)
(i) bottom left box labelled infrared
bottom right box labelled ultraviolet
(ii) treating cancer / identifying cancer / gamma ray photography / sterilise medical equipment
Question
(a) Fig. 8.1 shows an incomplete diagram of the electromagnetic spectrum.
Complete Fig. 8.1 with the names of the missing types of radiation in the correct boxes.
(b) State one use for ultraviolet radiation.
Answer/Explanation
Answer:
(a) In order from left to right:
γ / gamma (rays) X-rays
infrared (rays / waves)
microwaves
(b) sun beds OR security marking