Electromagnetic Spectrum

Determine the wavelength where the radiation is brightest.

wavelength = ______

Visible light has a wavelength between $4.0 \times 10^{-7}\ \text{m}$ and $7.0 \times 10^{-7}\ \text{m}$.

The radiation in (a) lies just outside the visible part of the electromagnetic spectrum.

State the name of the region of the spectrum that contains the radiation in (a).

Determine the frequency of the radiation in (a).

The speed of light is $3.0 \times 10^8\ \text{m/s}$.

frequency = ______

State the name of the component labelled:

• A ______
• B ______
• C ______

State the name of the component of the electromagnetic spectrum that has:

the greatest frequency ______
the smallest wavelength ______

Explain how X-rays are used to produce an image of a broken bone in a patient's leg.

the largest wavelength, ______

the highest frequency. ______

Visible light, infra-red, ultra-violet and radio waves are four components of the electromagnetic spectrum.

State two other components of the electromagnetic spectrum and describe a different use that is made of each component.

1. component ______
   description of use ______

2. component ______
   description of use ______

The list below contains three components of the electromagnetic spectrum.

Arrange the components in order of increasing wavelength.

______

State which component of the electromagnetic spectrum is used to transmit the television signal to the satellite.

Explain how the satellite is used.

Suggest one advantage of using a satellite to transmit television signals.

component P,

______

component Q.

______

All electromagnetic waves have a wavelength and a frequency. They all have changing magnetic and electric fields. State two other properties of all electromagnetic waves.

1. ______
2. ______

State the component of the electromagnetic spectrum used for satellite communication.

______

Fig. 6.1 shows part of a page from a pupil’s notebook.

List three errors in the pupil’s notes.

1. ______
2. ______
3. ______

State and explain one application of X-rays in engineering.

Explain why only electromagnetic waves are used to transmit the television signal.

State the region of the electromagnetic spectrum used to transmit the television signal.

Suggest why satellites are sometimes used to transmit television signals.

The other television sets receive the signal directly from a ground-based transmitter very near to the shop. A salesman notices that the signal sent via the satellite arrives $0.24\text{ s}$ later than the signal sent directly to the other television sets.

The speed of electromagnetic waves is $3.0 \times 10^8\text{ m / s}$.

Calculate the distance travelled by the television signal in $0.24\text{ s}$.

distance = ______

State the name of the spectrum of waves that includes X-rays.

State the name of the waves in this spectrum that have the greatest frequency.

Explain how this is done. You may draw a diagram if you wish.

Explain why X-rays are not used for pre-natal scanning.

State the names of all three regions in order of increasing frequency.

smallest frequency ______
intermediate frequency ______
largest frequency ______

Some of the ultraviolet radiation emitted by the Sun reaches the surface of the Earth.

Give one possible damaging effect of ultraviolet radiation on the human body and the property of ultraviolet radiation that causes this damage.

damaging effect ______
property ______

Fig. 5.1 represents the electromagnetic spectrum divided into the seven main regions.

The regions are arranged from left to right in order of increasing wavelength.

On Fig. 5.1:

• indicate the microwave region by marking it with the letter M
• indicate the ultraviolet region by marking it with the letters UV.

Describe how microwaves are used in satellite television systems.

All microwave ovens have a switch that turns the oven off when the door is opened.

Suggest why it is important for a microwave oven to switch off when the door is opened.