Black Body Radiation

The graph shows how the intensity of different wavelengths of radiation from a hot object varies with temperature. What can NOT be concluded from the graph about how the distribution of the intensity of radiation from an object changes as the temperature of the object increases?

• the intensity of every wavelength increases

• the shorter the wavelength the more rapid the increase in intensity

• the peak intensity occurs at shorter wavelength

• the intensity of every wavelength decreases

A student was asked to investigate the heat loss from two metal cans, L and M. The cans were identical except for the outside colour. The student filled the two cans with equal volumes of hot water. He then placed the temperature sensors in the water and started the data logger. The computer used the data to draw the graph below. Which one of the following is a categoric variable?

• the outside colour of the cans

• the starting temperature of the hot water

• the time

• the volume of hot water

The volume of the piece of rock was 18.0 cm³. The student measured the mass of the piece of rock as 48.6 g. The graph below shows the densities of different types of rock. What is the most likely type of rock that the student had?

• Basalt

• Flint

• Granite

• Limestone

• Sandstone

A student investigated the cooling effect of evaporation.She used the equipment (datalogger and probe) shown in the image to measure how the temperature of a liquid changed as the liquid evaporated. Which type of variable was the temperature in this investigation?

• control

• dependent

• independent

The diagram shows an atom of uranium-235 being split into several pieces. Name the process shown in the diagram.

• nuclear fission

• nuclear fusion

• chemical reaction

• chain reaction

The diagram shows an atom of uranium-235 being split into several pieces. Name the particles labelled X.

• neutrons

• alpha particles

• beta particles

• protons

Uranium-235 is used as a fuel in some nuclear reactors. Name another substance used as a fuel in some nuclear reactors.

• plutonium

• coal

• thallium

• gallium

How are stars able to give out energy for millions of years?

• By atoms joining together

• By atoms splitting apart

• By atoms joining togetherBy atoms splitting apartBy burning gases

How many protons and how many neutrons are there in an alpha particle?

• protons: 2

  neutrons: 2

• protons: 2

  neutrons: 1

• protons: 1

  neutrons: 1

• protons:1

  neutrons: 2

The pie chart shows the sources of the background radiation and the radiation doses that the average person in the UK is exposed to in one year. Radiation dose is measured in millisieverts (mSv). A student looked at the pie chart and then wrote down three statements. Which one of the following statements is a correct conclusion from this data?

• In the future, more people will be exposed to a greater proportion of radon gas.

• People that have never had an X-ray get

  50 % of their radiation dose from radon gas.

• The radiation dose from natural sources

  is much greater than from artificial sources.