As - Interim Assessment Jan 2012

8/3/2019 As - Interim Assessment Jan 2012

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WORDBRIDGE INTERIM ASSESSMENT (ALP AS)

1 (a) State three pieces of evidence provided by the photoelectric effect for aparticulate nature of electromagnetic radiation.

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[3](b) (i) Briefly describe the concept of a photon.

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(ii) Explain how lines in the emission spectrum of gases at low pressure provideevidence for discrete electron energy levels in atoms.

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............................. [2] (c)Three electron energy levels in atomic hydrogen are

represented in Fig. 1.1.

Fig. 1.1

The wavelengths of the spectral lines produced by electron transitions betweenthese three energy levels are 486 nm, 656 nm and 1880 nm.(i) On Fig. 1.1, draw arrows to show the electron transitions between the energylevels that would give rise to these wavelengths.

Label each arrow with the wavelength of the emitted photon. [3]

(ii) Calculate the maximum change in energy of an electron when makingtransitions between these levels.

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2 (a) Explain what is meant by the diffraction of a wave.

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(b) (i) Outline briefly an experiment that may be used to demonstrate diffractionof a transverse wave.

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(ii) Suggest how your experiment in (i) may be changed to demonstrate thediffraction of a longitudinal wave.

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3 A potential divider circuit consists of two resistors of resistances P and Q, asshown in Fig. 3.1.

Fig. 3.1

The battery has e.m.f. E and negligible internal resistance.

(a) Deduce that the potential difference Vacross the resistor of resistance P isgiven by the expression

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(b)The resistances P and Q are 2000 and 5000 respectively.A voltmeter is connected in parallel with the 2000 resistor and a thermistor isconnected in parallel with the 5000 resistor, as shown in Fig. 3.2.

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Fig. 3.2

The battery has e.m.f. 6.0 V. The voltmeter has infinite resistance.(i) State and explain qualitatively the change in the reading of the voltmeter asthe temperature of the thermistor is raised.

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(ii)The voltmeter reads 3.6 V when the temperature of the thermistor is 19 oC.Calculate the resistance of the thermistor at 19 oC.

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4. A laser emits light of wavelength 600 nm.What is the distance, expressed as a number of wavelengths, travelled by thelight in one second?

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A. 5 108B. 5 1011C. 5 1014D. 5 1017

5. The diagram shows two waves X and Y.

Wave X has amplitude 8 cm and frequency 100 Hz. What are the amplitude andfrequency of wave Y?

6. Light can exhibit all of the properties listed. Which property can sound notexhibit?

A. interferenceB. polarisation

C. refractionD. total internal reflection

7. Which graph best represents the way the current I through a filament lampvaries with the potential difference V across it?

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8. The diagram represents the screen of a cathode-ray oscilloscope displaying twosound waveslabelled X and Y.

9. T is a microwave transmitter placed at a fixed distance from a flat reflecting

surface S.

A small microwave receiver is moved from T towards S and receives signals ofalternate maxima and minima of intensity. The distance between one maximumand the next is 15 mm.

What is the frequency of the microwaves?

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A. 1.0 107HzB. 2.0 107HzC. 1.0 1010HzD. 2.0 1010Hz

*10. Which operation involves the greatest mean power?

A. a car moving against a resistive force of 0.4 kN at a constant speed of 20 ms1

B. a crane lifting a weight of 3 kN at a speed of 2m s1

C. a crane lifting a weight of 5 kN at a speed of 1m s1

D. a weight being pulled across a horizontal surface at a speed of 6 ms1 againsta frictional force of 1.5 kN

11. The diagram shows two loudspeakers producing sound waves that are in

phase.

As a student moves from X to Y, the intensity of the note she hears is alternatelyloud and quiet.

The distance between adjacent loud and quiet regions may be reduced by

A. decreasing distance d.B. increasing distance L.C. decreasing the amplitude.

D. increasing the frequency.

12. The diagram shows a circuit containing three resistors in parallel.

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The battery has e.m.f. 12 V and negligible internal resistance. The ammeterreading is 3.2 A.What is the resistance of X?

A. 2.1

B. 4.6 C. 6.0 D. 15

*13. A stone is thrown upwards and follows a curved path.

Air resistance is negligible. Why does the path have this shape?

A. The stone has a constant horizontal velocity and constant verticalacceleration.

B. The stone has a constant horizontal acceleration and constant vertical

velocity.C. The stone has a constant upward acceleration followed by a constant

downward acceleration.D. The stone has a constant upward velocity followed by a constant downward

velocity.

14. Complete the following table

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ElectromagneticWave

Wavelength Frequency Use

Gamma

X-ray

Ultraviolet

Visible Light

Infrared

Microwaves

TV and RadioWaves[21]

(1 mark for neatness)

15. A boy throws a ball vertically upwards. It rises a maximum distance of 28.0 m

in 2.4 s.

(a) (i) Calculate the distance of the ball above the point of release 3.8 s after

it was thrown.

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(ii) State an assumption you have made.

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(b) The ball is caught by the boy.

Explain why moving his hands downwards as he catches the ball will reducethe force that the ball applies to his hand. You may be awarded a mark for theclarity of your answer.

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16. (a) The enlarged diagram shows a circular copper disc. It has a diameter of 30mm and a thickness of 5.0 mm.

Show that the weight of the disc is about 0.3 N. (Density of copper = 8900 kg m3)

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(b) (i) State Newtons first law of motion.

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(ii) Two copper discs as described in part (a) of the question are placed on topof one another as shown in the diagram below.

Figure 1 and Figure 2 are free-body force diagrams which show the resultantupward and the resultant downward forces acting on the discs A and Brespectively. Label the magnitude of the forces P, Q,Xand Y.

(iii) A force Fforms a Newtons third law pair with the force Q.State the following:

magnitude ofF

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direction ofF

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type of force

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object upon which Facts

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TOTAL FOR THIS PAPER: 81 MARKS

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As - Interim Assessment Jan 2012

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