CSEC Physics Paper 2 May/June 2016 - Free CXC Past Paper with Answers

Using the grid on page 5, plot a graph of Activity $(A)$ versus Time $(t)$.

From your graph, determine the half-life of the sample.

Using your graph, determine a more accurate value of the half-life of the sample.

From your graph, and using dotted lines, determine how long it takes for the activity of the sample to be reduced to 10 disintegrations per second, from its original activity level.

State ONE reason why a line drawn through all the points would not form a perfectly smooth curve.

All elements including radioactive substances have an 'atomic number' and 'mass number'. Explain what the two terms mean.

Atomic number: Mass number:

In medicine, iodine-123, $\text{}_{53}^{123}\text{I}$ is used to check a patient's thyroid function. What does '123' represent?

Complete the bubbles in Figure 1 by inserting the SI unit which matches EACH of the physical quantities.

Figure 1

[Image: Table with 'Physical Quantity' and 'SI Unit (Word or symbol)' columns. Rows for 'Force' and 'Linear momentum' with arrows pointing to empty circles.]

State Newton's third law of motion.

A Caribbean airplane on its way from the Piarco International Airport to the Grantley Adams International Airport flies horizontally in mid-flight.

With the aid of a diagram, and using Newton's third law of motion, explain how this happens.

Define the term 'linear momentum'.

An 8 kg ball travelling to the east at $10 \text{ ms}^{-1}$ , collides with a 2 kg ball travelling to the west with a velocity of $5 \text{ ms}^{-1}$ . After the collision, they move together.

Determine the final velocity of the balls. Assume that there are no resistive forces.

State, in words, the quantity EACH symbol represents in the equation $E_H = mc\Delta\theta$ . State the SI unit of EACH quantity as well.

$E_H$ : $m$ : $c$ : $\Delta\theta$ :

What does the symbol ' $l$ ' in the equation $E_H = ml$ represent?

In an experiment to determine the specific latent heat of fusion of ice using a container with negligible heat capacity, a student obtained the following data:

Initial temperature of water = $30 \text{ \degree C}$
Final temperature of water + melted ice = $20 \text{ \degree C}$
Initial mass of water = $100 \text{ g}$
Final mass of water plus melted ice = $110 \text{ g}$

[Specific heat capacity of water = $4.2$ ]

Calculate the heat lost by the water.

Calculate the heat gained by the melted ice.

Assuming the heat lost by the water is equal to the heat gained by the ice, calculate the specific latent heat of fusion of ice.

[Specific heat capacity of water = $4.2 \text{ Jg}^{-1}\text{K}^{-1}$ ]

List THREE types of electromagnetic waves in order of increasing wavelength. Identify a use of EACH type of wave.

Humans can 'see' electromagnetic radiation only between the wavelengths of about $4 \times 10^{-7} \text{ m}$ and $7 \times 10^{-7} \text{ m}$ . This is called the visible part of the spectrum.

A rattlesnake can detect e.m. radiation of frequency $3.5 \times 10^{13} \text{ Hz}$ and a honeybee can detect e.m. radiation of $1 \times 10^{15} \text{ Hz}$ .

Calculate the wavelengths corresponding to EACH frequency.

Thunder is heard 2.3 seconds after a flash of lightning is seen. If the lightening strike is $750 \text{ m}$ away, calculate the speed for this event.

[Speed of light, $c = 3 \times 10^8 \text{ ms}^{-1}$ ]

How does the electric current in a metal differ from that in an electrolyte? Compare EACH with 'conventional current'.

State which of these two media (metal and electrolyte) has similar current flow to that in a semiconductor. Give a reason for your answer.

The makers of a popular cellphone have upgraded its battery capacity from $4320 \text{ C}$ to $9000 \text{ C}$ .

The makers of a popular cellphone have upgraded its battery capacity from $4320\text{ C}$ to $9000\text{ C}$ .

If the standard charger can deliver a current of $0.6\text{ A}$ , how much more time will it take to charge the new battery than the old battery?

In order to maintain a competitive edge, the cellphone maker needs to keep the same charging time for the new model the same as the old model. What must be the current rating on a new charger to accomplish this?

A student was given a sample of candle wax in a test tube located in a water bath. She was asked to demonstrate that temperature remains constant during a phase change.

Describe the procedure she should use.

In Dominica, hydroelectricity is used to supply energy on a large scale.

Describe how electricity is generated using the process of hydroelectricity.

Discuss the rationale for the application of hydroelectricity as a viable alternative energy source in Dominica.

CSEC Physics Paper 2 May/June 2016 Questions

Question 1 (25 marks)

Question 2 (15 marks)

Figure 1

Question 3 (15 marks)

Question 4 (15 marks)

Question 5 (15 marks)

Question 6 (15 marks)