(a) The table gives information about some ways of reducing the energy consumption in a house.
Electrical Appliances – Question 2 was last modified: October 29th, 2015 by
Electrical Appliances – Question 2
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Waves – Question 4
(a) The new Tetra communications system to be used by the police transmits digital signals using microwaves of wavelength 75 cm.
The signals travel through the air at 300 000 000 m/s.
(i) What is a digital signal?
Waves – Question 4 was last modified: October 13th, 2015 by
Red Shift – Question 3
(a) A student listens to the sound waves produced by a car siren. When the car is stationary, the student hears a constant frequency sound.
Describe how the wavelength and frequency of the sound waves heard by the student change when the car is driven away from the student. Continue reading
Red Shift – Question 3 was last modified: October 9th, 2015 by
Generating Electricity – Question 2
The diagram shows how electricity is distributed from power stations to consumers.
Generating Electricity – Question 2 was last modified: October 9th, 2015 by
Heat Transfer – Question 3
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.
Heat Transfer – Question 3 was last modified: October 9th, 2015 by
Red Shift – Question 2
The ‘steady state’ theory was once a popular alternative to the ‘big bang’ theory.
The ‘steady state’ theory suggested that the universe, although expanding, had no origin and it has always existed. As the universe expands, a small amount of matter is created to keep the universe looking exactly the same all of the time.
Red Shift – Question 2 was last modified: September 12th, 2015 by
Waves – Question 3
(a) The wavelengths of four different types of electromagnetic wave, including visible light waves, are given in the table.
Waves – Question 3 was last modified: September 12th, 2015 by
Electrical Appliances – Question 1
The diagram shows the label from a new freezer.
Electrical Appliances – Question 1 was last modified: October 29th, 2015 by
Energy Efficiency – Question 1
(a) The diagram shows the energy transformations in a fuel burning power station.
Energy Efficiency – Question 1 was last modified: August 27th, 2015 by
Heat Transfer – Question 1
A student had read about a glacier that had been covered in insulating material. The idea was to slow down the rate at which the glacier melts in the summer.
She investigated this idea using the apparatus shown in the diagram.
Heat Transfer – Question 1 was last modified: August 6th, 2015 by