Theory

CH11 - ATOMS AND RADIOACTIVITY

A certain element is known to exist as two different isotopes.(a) State one thing that is the same for atoms of both isotopes............................

2010 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

Emissions from a radioactive source pass through a hole in a lead screen and into a magnetic field, as shown in Fig. 10.1. Radiation detectors are p...

2010 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

(a) An atom consists of a nucleus made up of protons and neutrons, surrounded by orbiting electrons.(i) Which of these particles has a positive charge...

2011 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A scientist needs to use a source of $\gamma$-rays as safely as possible.Which action will not reduce the amount of radiation that reaches the scienti...

2011 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A nuclide of substance X has the symbol $^{26}_{12}X$.How many electrons are there in a neutral atom of substance X?A. 12 B. 14 C. 26 D. 38

2011 Winter

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

The graph shows the activity of a radioactive source over a period of time. What is the half-life of the source? A $\frac{1}{2}$ hour B 1 hour C ...

2011 Winter

3

Theory

CH11 - ATOMS AND RADIOACTIVITY

A radioactive nucleus contains 138 neutrons. The nucleus emits an \( \alpha \)-particle. How many neutrons are in the nucleus after it has emitted th...

2009 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

The graph shows the decay curve for one particular radioactive nuclide. What is the half-life of this nuclide? A. 1.0 day B. 1.5 days C. 2.0 days D. ...

2009 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

Which diagram could represent the structure of a neutral atom?[Image_1: Diagrams A, B, C, and D with key indicating neutron, proton, electron]

2012 Summer

2

Theory

CH11 - ATOMS AND RADIOACTIVITY

A radioactive element has a half-life of 70s.The number of emissions per second, $N$, of a sample of the element is measured at a certain time.What wa...

2010 Winter

2

MCQ

CH1 - MEASUREMENTS AND UNITS

Which measuring devices are most suitable for determining the length of a swimming pool and the thickness of aluminium foil? [Table_1]

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

A man stands next to a railway track.A train travelling at 40 m/s takes 2.0 s to pass the man.What is the length of the train?

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

A speed–time graph is used to describe the motion of an object. Which quantities are calculated from the gradient of the graph and from the area un...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

On the Moon, all objects fall with the same acceleration. Which statement explains this?

2022 Summer

1

MCQ

CH3 - FORCES AND PRESSURE

A measuring cylinder contains 30 cm³ of a liquid.Some more of the liquid is added until the liquid level reaches the 50 cm³ mark. The reading on the...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

An object on the end of a string moves in a clockwise circular path at constant speed. The diagram shows the object as viewed from above. What is the ...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

A beam is pivoted at one end, as shown. The beam weighs 6.0 N and its weight acts at a point X 40 cm from the pivot. A force of 4.0 N is applied to th...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

On the diagram shown, what is the magnitude of the resultant force of the two vectors?[Image: A diagram with two vectors; one vector of 6.0 N upwards ...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

Three situations are listed.1. An object has a resultant force acting on it.2. A moving object experiences an impulse.3. An object is decelerating.In ...

2022 Summer

1

MCQ

CH2 - FORCES AND MOTION

A ball of mass 0.16 kg is moving forwards at a speed of 0.50 m/s. A second ball of mass 0.10 kg is stationary. The first ball strikes the second ball....

2022 Summer

1