single higher content

Question 1

How does heat travel through space?

Answer 1

By infrared waves

Question 2

What emits and absorbs thermal radiation?

Answer 2

All bodies

Question 3

What is thermal (infrared) radiation?

Answer 3

The transfer of energy by electromagnetic waves

Question 4

What is a thermograph?

Answer 4

The images taken using infrared radiation

Question 5

If an object’s temperature is higher, what will happen to the infrared radiation it’s emitting?

Answer 5

Higher temperature -> more infrared radiation emitted in a given time

Question 6

What happens as a filament lamp warms up?

Answer 6

• doesn’t glow, emits infrared
• warms up glows dull red -> emitting visible spectrum
• orange-red
• yellow-white as filament gets hotter

Question 7

What does the intensity of radiation at a certain wavelength depend on?

Answer 7

Temperature

Question 8

What happens as temperature and radiation increases?

Answer 8

Radiation increases at every wavelength and the peak moves to a shorter wavelength (high frequency)

Question 9

What happens to radiation as temperature increases?

Answer 9

If temperature increases, intensity of radiation increases at every wavelength so peak moves to a shorter wavelength

Question 10

What does the temperature of the earth depend on?

Answer 10

1. The rate that light and infrared radiation are absorbed by the atmosphere/surface or are reflected back into space
2. The rate at which the earth emits radiation from its surface and atmosphere

Question 11

How do loudspeakers work?

Answer 11

• ac current is passed through coil which is attached to paper cone
• current causes force on coil so paper cone moves
• current reverses and force acts on cone in opposite direction
• cone vibrates