A bat emits a sound wave with a frequency of 25.0 kHz and a wavelength of 0.0136 metres. Calculate the speed of this sound wave.
In this question you are given frequency and wavelength of the wave and you are asked for the speed. You need to use the formula on you sheet that uses these three properties : v = f x λ, where v is the speed, f is the frequency and λ is the wavelength.
You know from the question that f = 25kHz and λ = 0.0136m, however 1 kHz is actually 1000 Hz and you need to remember this before you do your calculation. Therefore the numbers you need to put into your calculator are f = 25 x 1000 = 25000 and λ = 0.0136.
The calculation that you then need to do is 25000 x 0.0136 = 340. You must not forget the units of speed, which here are metres per second, or m/s. Your final answer is 340 m/s.
LD
Related Physics GCSE answers
All answers ▸a bat emits sound waves with a range of wavelengths. Some of the sound waves will be diffracted by the insect. Complete the following sentences to explain why. [2 marks] Diffraction is caused by the sound waves _______________________________________
Alice and Bob are sat on a seesaw. The seesaw is in static equilibrium. Alice weighs 500N and is sat 0.5m to the left of the pivot. If Bob weighs 800N, how far from the pivot on the right is he sat? What happens if Bob moves closer to the pivot?
Two identical objects have a charge of magnitude q. If r is the distance bethween them, what should their mass be so that the objects are balanced.
What is the difference between a transverse and a longitudinal wave?