MS.RAJA ELGADY/RADIOACTIVITY PAPER 3 ELGADY/RADIOACTIVITY PAPER 3 1-Fig. 9.1 shows an experiment...

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Transcript of MS.RAJA ELGADY/RADIOACTIVITY PAPER 3 ELGADY/RADIOACTIVITY PAPER 3 1-Fig. 9.1 shows an experiment...

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 31- Fig. 9.1 shows an experiment carried out in a vacuum to investigate the deflectionof

    -particles and -rays in a magnetic field.

    ForExaminers

    Use

    N

    magnet

    radioactive sourceemitting _-particles

    and a-rays

    S

    lead cylinderwith small hole thin beam of

    _-particles anda-rays

    Fig. 9.1

    (a) Complete the table to describe the deflection, if any, of the -particles and the -rays inthe magnetic field shown. Place one tick in each column.

    possible deflection -particles -rays

    no deflection

    towards N pole of magnet

    towards S pole of magnet

    out of paper

    into paper[3]

    (b) The experiment of Fig. 9.1 was carried out in a vacuum.

    State the effect of carrying out the experiment in air.

    ..................................................................................................................................... .....

    ............................................................................................................................ ..............

    ............................................................................................................................. ........ [2]

    (c) State and explain the purpose of the lead cylinder.

    ..........................................................................................................................................

    ............................................................................................................................. .............

    ..................................................................................................................................... [2]

    [Total: 7]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 32- (a) Chlorine has two isotopes, one of nucleon number 35 and one of nucleon number 37.

    The proton number of chlorine is 17.

    Table 11.1 refers to neutral atoms of chlorine.

    Complete Table 11.1.

    ForExaminers

    Use

    nucleon number 35 nucleon number 37

    number of protons

    number of neutrons

    number of electrons

    Table 11.1[3]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3(b) Some isotopes are radioactive.

    State the three types of radiation that may be emitted from radioactive isotopes.

    1. .......................................................

    2. .......................................................

    3. ....................................................... [1]

    (c) (i) State one practical use of a radioactive isotope.

    ..................................................................................................................................

    ............................................................................................................................ [1]

    (ii) Outline how it is used.

    ............................................................................................................................... ...

    ............................................................................................................................. .....

    ............................................................................................................................. .....

    ...................................................................................................................... ............

    ............................................................................................................................ [1] [Total: 6]

    3- Emissions from a radioactive source pass through a hole in a lead screen and into a magneticfield, as shown in Fig. 10.1.

    radioactivesource

    A magnetic fieldinto paper

    B

    leadscreen

    C

    3 cm

    Fig. 10.1

    Radiation detectors are placed at A, B and C. They give the following readings:

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3A B C

    32 counts /min 543 counts /min 396 counts /min

    The radioactive source is then completely removed, and the readings become:

    A B C

    33 counts /min 30 counts /min 31 counts /min

    (a) Explain why there are still counts being recorded at A, B and C, even when the radioactivesource has been removed, and give the reason for them being slightly different.

    ............................................................................................................................. ......................

    .................................................................................................................................. .................

    ................................................................................................................ ...................................

    ............................................................................................................................. ................ [2]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3(b) From the data given, deduce the type of emission being detected, if any, at A, at B and at C

    when the radiation source is present.

    State the reasons for your answers.

    detector at A .............................................................................................................................

    ........................................................................................................................................... ........

    ......................................................................................................................... .................... [2]

    detector at B .............................................................................................................................

    ........................................................................................ ...........................................................

    ............................................................................................................................. ................ [3]

    detector at C .............................................................................................................................

    ............................................................................................................................. ......................

    .......................................................................................................................................... ... [3]

    [Total: 10]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 34- Fig. 11.1 shows the paths of three -particles moving towards a thin gold foil. Examiners

    Use

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 34- Fig. 11.1 shows the paths of three -particles moving towards a thin gold foil.

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3goldfoil

    A

    B

    C

    Fig.11.1

    Particle A is moving directly towards a gold nucleus.Particle B is moving along a line which passes close to a gold nucleus.Particle C is moving along a line which does not pass close to a goldnucleus.

    (a) On Fig. 11.1, complete the paths of the -particles A, B and C. [3]

    (b) State how the results of such an experiment, using large numbers of -particles, provides evidence for the existence of nuclei in gold atoms.

    ..........................................................................................................................................

    ..........................................................................................................................................

    ............................................................................................................................. .............

    .................................................................................................................................... [3] [Total: 12]

    11 (a) State, in terms of the particles in each nucleus, how the nuclei of two isotopes of the sameelement are different.

    ............................................................................................................................. ..................[1]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3

    P

    83

    83

    83

    (b) Fig. 11.1 shows a graph of nucleon number against proton number. The nucleus 212 Bi isplotted on the graph at the cross marked P.

    213

    212

    nucleonnumber

    211

    210

    209208

    79 80 81 82proton number

    83 84

    (i) On Fig. 11.1,Fig. 11.1

    1. plot a cross labelled Q for the nucleus formed when the 212 Bi nucleus emits an-particle,

    2. plot a cross labelled R for the nucleus formed when the 212 Bi nucleus emits a-particle.

    [4]

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 383

    8383

    (ii) The half-life for the decay of 212 Bi is 60minutes.

    A sample of 212 Bi is placed at a fixed distance from a detector. The initialmeasurement of the count rate from the sample of 212 Bi is 2400 counts perminute.

    Calculate the count rate from the sample 5.0 hours later.

    count-rate = ...........................................................[2] [Total: 7]

    5- A beam of ionising radiation, containing -particles, -particles and -rays, is travelling left toright across the page. A magnetic field acts perpendicularly into the page.

    (a) In the table below, tick the boxes that describe the deflection of each of the types ofradiation as it passes through the magnetic field. One line has been completed, to helpyou.

    ForExaminers

    Use

  • MS.RAJA ELGADY/RADIOACTIVITY PAPER 3not

    deflecteddeflectedtowards

    top of page

    deflectedtowards

    bottom of page

    largedeflection

    smalldeflection

    -particle