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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 _______________________________________

spreading out
RT
Answered by Ralph T. • Physics tutor
3917 Views

A 950 kg car accelerates from 0 to 33 m/s in 11 seconds. a) Calculate the acceleration of the car b) Calculate the force needed to produce this acceleration c) The car claims a top speed of 110 miles/hr. Explain why there must be a top speed for any car

a) a=v-u/t = 33/1 = 3 b) F = ma = 950x3 = 2850 c) Friction and air resistance increases with speed, till frictional = max forward force, then force/acceleration is zero
RB
Answered by Raina B. • Physics tutor
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What is the difference between EMF and Voltage?

EMF stands for the Electromotive Force and it can be defined in a few ways: 1. It's the potential across the terminal ends of a cell. 2. Or in other words, the amount of energy that is given to a charge in i...
FG
Answered by Francisco G. • Physics tutor
2489 Views

What actually is current? Why does it differ from potential difference?

Current is defined as 'the flow of electric charge'. It can be broken down into very simple system of electrons, who carry charge, moving around a circuit. Potential difference can be thought of the force th...
JO
Answered by James O. • Physics tutor
7665 Views

I dont really understand the Rutherford experiment

Rutherford revolutionised the atomic model with this experiment. At that time, the general idea was that of JJ Thompson, the "plum pudding" atomic model. Rutherford bombarded a sheet of gold with a...
ES
Answered by Eduardo S. • Physics tutor
3621 Views