Search Results for: label/Physics AS

Non-Relativistic Doppler Effect – All You Need To Know

The concept around the Doppler effect is basically how much a wave stretches or bunches due to the speed it is travelling at. The most common scenario you will experience the Doppler effect will be with an Ambulance. As you here the sirens approach you, the waves will have been ‘squished’ or compressed producing …

Gravitational Potential – Non-Uniform and Uniform Fields

The gravitational potential energy of an object is the potential energy per kilogram of an object placed at that specific point.  For a Uniform Field The equation below applies to when there is a uniform field such as when we are talking about being very close to the …

Signalling – Chapter 3 – Physics AS

This article will go over all you need to know in the A Level Physics which includes advantages of digital signalling, analogue signalling, converting between digital to analogue and analogue to digital, sampling, polarisation, sensing circuits, resolution, bandwidth and a sampling summary including sampling rate and channel capacity (I think …

Sensing – Chapter 2 – Physics AS

In this article I will go through all you need to know for Physics AS on Chapter 2. This will include going over in order (I think!) current, flow of charge per second, voltage (or potential difference), resistance in series and parallel, potential dividers, internal resistance and EMF …

Magnification in Convex Lenses

You should know how to work out magnification in convex lenses for Physics A Level. Magnification happens in convex lens through the formula: Magnification = image height / object height = V/U From the below diagram, we can see the object height and image height as well as …

Wave Fronts On a Convex Lens

Wave fronts on convex lenses help us identify the focal length of the lens which identifies the power of it too using P = 1/F. Wave fronts on lenses are more easily described through the use of diagrams. As you can see from this diagram, the focal length is the …

Focus Length Of a Convex Lens: 1/V = 1/U +1/F

The focal length for convex lenses never changes with it being on the power of the lens. A convex is lens is thicker the further to the centre of the lens. Due to light travelling slower through glass, it forces the light waves to bend on the top and …

Bits, Bytes and Binary Codes

All images and every digital sounds are made from ‘0’s and ‘1’s. Each one of these digits is called a binary digit. Each binary digit is 1 bit. 8 bits make up a byte. Confused? Well don’t worry, that’s what bits, bytes and binary codes are in the …

Electromagnetic Spectrum – Different Kinds of Images and Resolutions

Below are examples of different kinds of images along the electromagnetic spectrum. Infrared, x-rays, radio waves, ultraviolet, ultrasound and even down to the atomic level, there are examples of all different types of images with estimations of the resolutions worked out as well. If you don’t know how to work …

[How to] Calculate Resolution Of An Image

In Physics AS, it is important to know how to work out the resolution of a given image. The resolution is… The size, in real life, of one pixel or real life length / no. of pixels For this reason, it is usually measured in metres per pixel. …