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physics Physics For High Schools (KS4)

Solved problems for the chapter:

Microwaves

View the theory »

Introduction to Light

1. Speed of light

2. Wavelength and frequency of light

3. Sources of light

3.1. Light sources based on black body radiation

3.2. Light emission due to changes in the energy levels of atoms

4. Luminous intensity and illuminance

5. Light perception

6. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:microwaves/3614/

Example 1.

What is the speed of microwaves in air?

Example 2.

Which radiation has a lower frequency than microwaves?

ultraviolet
radio waves
red light
infrared

Which row matches a region of the electromagnetic spectrum to one of its uses?

	region	use
A	gamma rays	intruder alarms
B	infrared	satellite television
C	microwaves	mobile (cell) phones
D	radio waves	sterilising food

Microwaves, green light, and infrared are three types of electromagnetic radiation. What is their order when listed by wavelength from the shortest wavelength to the longest?

The diagram below shows the electromagnetic spectrum. The numbers indicate the approximate wavelength at the boundaries between the various regions of the spectrum.

For a device to be able to make use of electromagnetic radiation, it needs an aerial of approximately the same size as the wavelength of the radiation it is designed to work with. Which statement is correct?

A mobile phone uses radiation from region P.
A television satellite dish uses radiation from region Q.
The receptor cells in an eye use radiation from region R.
The remote controller for a television uses radiation from region U.

Visible light, X-rays, and microwaves are all components of the electromagnetic spectrum. Which statement about the waves is correct?

In a vacuum, microwaves travel faster than visible light and have a shorter wavelength.
In a vacuum, microwaves travel at the same speed as visible light and have a shorter wavelength.
In a vacuum, X-rays travel faster than visible light and have a shorter wavelength.
In a vacuum, X-rays travel at the same speed as visible light and have a shorter wavelength

Microwaves and X-rays are regions of the electromagnetic spectrum. Which statement about microwaves and X-rays is correct?

Microwaves and X-rays have the same frequency.
Microwaves and X-rays travel at the same speed in a vacuum.
Microwaves have a shorter wavelength than X-rays
Microwaves travel at a lower speed than X-rays in a vacuum.

The diagram shows three types of electromagnetic radiation listed in a particular order. The electromagnetic radiation is travelling in a vacuum.

Which quantities increase in magnitude going from left to right across the list?

frequency only
neither speed nor frequency
speed and frequency
speed only

Two students are describing different types of electromagnetic radiation.

student 1: This radiation is used in communications.

student 2: This radiation is used in remote controllers.

Which row shows the possible type of radiation that each student is describing?

	student 1	student 2
A	microwave	infrared
B	radio	ultraviolet
C	sound waves	visible light
D	X-rays	gamma rays

10.

The diagram shows the electromagnetic spectrum.

A word is missing from the label below the spectrum. Which word is missing?

amplitude
frquency
speed
wavelngth

11.

The table below shows different types of wave in the electromagnetic spectrum.

Where do all the waves travel at the same speed?

in a vacuum
in diamond
in glass
in water

12.

Which description applies to microwave radiation?

longitudinal and electromagnetic
longitudinal but not electromagnetic
transverse and electromagnetic
transverse but not electromagnetic

13.

Which part of the electromagnetic spectrum is used to send television signals from a satellite to Earth?

infrared
microwaves
ultraviolet
visible light

14.

Radiation from which part of the electromagnetic spectrum is used in cooking?

infrared waves
radio waves
microwaves
ultraviolet waves

15.

Which group shows four electromagnetic waves in order, from the largest wavelength to the smallest?

microwaves, radio waves, X-rays, visible light
radio waves, microwaves, visible light, X-rays
visible light, X-rays, radio waves, microwaves
X-rays, visible light, microwaves, radio waves

16.

The box contains a list of four types of waves.

How many waves in the list have a wavelength shorter than that of microwaves?

17.

Radio waves and microwaves travel through the vacuum of space to the Earth. Which of the statements below is correct?
- Radio waves travel at a slower speed than microwaves.
- Radio waves travel at the same speed as microwaves.
- Radio waves travel at a faster speed than microwaves.
State one way in which sound waves are different from microwaves.

18.

The figure below represents the regions of the electromagnetic spectrum.

What regions are represented by the letters X, Y, and Z?
Complete the label under the arrow.

19.

The figure below shows the regions of the electromagnetic spectrum. Two regions have not been named.

Complete the figure by labelling the two regions that have not been named.
On the figure, circle the region with the longest frequency.

20.

The figure below represents the electromagnetic spectrum.

One type of wave is missing from the figure.

State its name.
One type of electromagnetic wave is used to send signals to satellites.

State its name.