Paper 4

Question 1

Measuring Frequency

Answer 1

STROBOSCOPE

1) Starting with the HIGHEST frequency, the frequency of the stroboscope is gradually reduced until the vibrating object appears STATIONARY.
2) This means that the frequency of stroboscope is equal to the frequency of the vibration of object

Question 2

Angle

Answer 2

Spectroscope

Place the diffraction grating of a spectroscope. Use the telescope to locate the position of the maxima, and use the scale of the spectroscope to find angle of deviation of the beam

Question 3

Fluid Flow Rate

Answer 3

Use a flow rate meter to determine the rate of flow of gas/liquid

MULTIPLY the flow rate density of the liquid to convert to mass flow rate

Question 4

Measure potential difference

Using CRO

Answer 4

Connect a CRO in parallel to ____-

Using the grid on the screen, measure the maximum distance occupied by a complete wave form

Multiply this distance by scale indicated on y scale to obtain a peak to peak voltage

Question 5

Measuring Magnetic field strength

Answer 5

Hall Probe

Positioned so that the field lines of magnetic field are right angle to the plane

Should be first calibrated using a magnetic field of unknown strength

Magnetic field strength proportional to the deflection in the meter

Question 6

Measuring velocity/time using a photogate

Answer 6

object is projected so that is passes through two photo gates

Velocity measured is an average velocity

Question 7

Measuring Acceleration

Answer 7

From a table of velocity vs time, a velocity time graph can be plotted. Gradient at various times can be used to calculate the acceleration

Question 8

Measuring temperature with data logger

Answer 8

place temperature sensor in the___
Connect the sensor to a data logger
Using the computer to extract a graph of temperature against time from information stored in data logger.

Question 9

Measuring Fluid pressure

Answer 9

1)Manometer
measure height difference between levels of mercury in the arms of U tube

2) Pressure gauge