# ocr-gateway-science-physics-paper-2

## Wave Speed

Wave speed is given in meters per second (the number of waves that pass per second). Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.

## Demo

In this tutorial you will learn how to calculate the speed of a wave.

The equation for this calculation is written like this:

$v = { \text f \; \text x \; \lambda }$

## Chilled practice question

Calculate the velocity of a wave with a wavelength of 6 m and a frequency of 50 Hz

## Frozen practice question

Find the velocity of a wave which has a time period of 10 s and a wavelength of 24 m, you will need to calculate the frequency from the wave period equation first.

## Science in context

Wave speed is given in meters per second (the number of waves that pass per second). Wave Speed = FrequencyWave length. Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.

## Millie’s Master Methods

### Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s Magic Triangle Teaches you to be confident when transposing an equation allowing …

### Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation Master Class Top Mark Routine Applying this technique will ensure you gain …

## The Fridge Physics Store

### Teacher Fast Feedback

Feedback to students in seconds – Voice to label thermal bluetooth technology Click …

### Get Fridge Physics Merch

Why not buy a Fridge Physics baseball cap, woollen beanie, hoodie or polo shirt, all colours and sizes available. Free delivery to anywhere in the UK! Fridge …

## Half Life

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease.

## What is Half life?

The radioactivity of a sample decreases over time. Half life is a measurement in this decrease.The halflife of a radioactive substance is a constant for each radioactive material. It measures the time it takes for a known amount of the substance to become reduced by half due to radioactive decay, and therefore, the emission of radiation.

## Half life demo

In this tutorial you will learn how to calculate the half life of a radioactive material.

## Chilled practice question

The activity of a radio-isotope is 1536 cpm. What is its activity after five half lives?

## Frozen practice question

A radio-isotopes activity falls from 1880 cpm to 235 cpm in 72 minutes. Calculate it’s half life.

## Science in context

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease

## Millie’s Master Methods

### Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s Magic Triangle Teaches you to be confident when transposing an equation allowing …

### Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation Master Class Top Mark Routine Applying this technique will ensure you gain …

## The Fridge Physics Store

### Teacher Fast Feedback

Feedback to students in seconds – Voice to label thermal bluetooth technology Click …

### Get Fridge Physics Merch

Why not buy a Fridge Physics baseball cap, woollen beanie, hoodie or polo shirt, all colours and sizes available. Free delivery to anywhere in the UK! Fridge …

## Efficiency

The efficiency of a device is the proportion of input energy that is converted to useful energy.

## What is Efficiency?

The efficiency of a device is the proportion of input energy that is converted to useful energy. Efficiency is a measure of how much work or energy is conserved in an energy transfer, work or energy can be lost, for example as wasted heat energy. The efficiency is the useful energy output, divided by the total energy input, and can be given as a decimal always less than 1 or a percentage. No machine is 100% efficient.

## Efficiency equation

To calculate Efficiency we use this equation.

$efficiency = {\text{useful energy output} \over\text{total energy input}}$

## Efficiency demo

In this tutorial you will learn how to calculate how efficient a device is at transferring energy from one form to another.

## Chilled practice question

Calculate the efficiency of a light bulb with a total input energy of 500 J. The bulb emits 200 J of light energy and 300 J of heat energy.

## Frozen practice question

A tumble drier is 80% efficient. Its useful energy is 45 KJ what is the total input energy in Joules.

## Science in context

The efficiency of a device is the proportion of the total input energy that is converted to useful energy.

## Millie’s Master Methods

### Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s Magic Triangle Teaches you to be confident when transposing an equation allowing …

### Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation Master Class Top Mark Routine Applying this technique will ensure you gain …

## The Fridge Physics Store

### Teacher Fast Feedback

Feedback to students in seconds – Voice to label thermal bluetooth technology Click …

### Get Fridge Physics Merch

Why not buy a Fridge Physics baseball cap, woollen beanie, hoodie or polo shirt, all colours and sizes available. Free delivery to anywhere in the UK! Fridge …

## Transformers

transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to “step up” or “step downvoltages and is based on the magnetic induction principle.

## Demo

In this tutorial you will learn how to calculate voltages in step up and step down transformers.

The equation is written like this:

${ \text V_{1} \; \text / \; \text V_{2} \; \text = \; \text N_{1} \; \text / \; \text N_{2} \;}$

## Chilled practice question

A transformer has 300 turns on its primary coil and 100 turns on it secondary coil. What voltage is induced in the secondary coil if the primary voltage is 96 V ?

## Frozen practice question

A transformer has 320 turns on the primary coil and 800 turns on the secondary coil. Find the voltage across the primary coil when the voltage across the secondary coil is 1320 V.

## Science in context

transformer is an piece of electrical apparatus which will increase or decrease the voltage in an alternating current. It can be designed to “step up” or “step downvoltages and is based on the magnetic induction principle.When a voltage is introduced to one coil, called the primary coil it magnetizes its core which is made from iron which induces a voltage in the secondary coil.

## Millie’s Master Methods

### Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s Magic Triangle Teaches you to be confident when transposing an equation allowing …

### Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation Master Class Top Mark Routine Applying this technique will ensure you gain …

## The Fridge Physics Store

### Teacher Fast Feedback

Feedback to students in seconds – Voice to label thermal bluetooth technology Click …

### Get Fridge Physics Merch

Why not buy a Fridge Physics baseball cap, woollen beanie, hoodie or polo shirt, all colours and sizes available. Free delivery to anywhere in the UK! Fridge …
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