EASY
AS and A Level
IMPORTANT
Earn 100

Copy and complete Table 12.2. (You may assume that the speed of radio waves is 3.00×108 m s-1)

Station Wavelength / m Frequency / MHz
Radio A (FM)   97.6
Radio B (FM)   94.6
Radio B (LW) 1515  
Radio C (MW) 693  

 

Important Questions on Waves

EASY
AS and A Level
IMPORTANT

A plane's engine emits a note of constant frequency 120 Hz. It is flying away from a stationary observer at a speed of 80 ms-1. Calculate:

(a) The observed wavelength of the sound received by the observer

EASY
AS and A Level
IMPORTANT

A plane's engine emits a note of constant frequency 120 Hz. It is flying away from a stationary observer at a speed of 80 ms-1. Calculate:

(b) Its observed frequency. (Speed of sound in air =330 ms-1.)

EASY
AS and A Level
IMPORTANT

Question Image

Add a third column showing the range of frequencies of each type of radiation.

EASY
AS and A Level
IMPORTANT
Type of electromagnetic waves Wavelength range / m
Radio waves >106 to 10-1
Microwaves 10-1 to 10-3
Infrared

10-3 to 7×10-7

Visible

7×10-7 (red to

4×10-7 (violet)

Ultraviolet 4×10-7 to 10-8
X - rays 10-8 to 10-13
λ - rays 10-10 to 10-16

Study Table  and answer the questions.

(a) Which type of radiation has the narrowest range of wavelengths?

EASY
AS and A Level
IMPORTANT
Type of electromagnetic waves Wavelength range / m
Radio waves >106 to 10-1
Microwaves 10-1 to 10-3
Infrared

10-3 to 7×10-7

Visible

7×10-7 (red to

4×10-7 (violet)

Ultraviolet 4×10-7 to 10-8
X - rays 10-8 to 10-13
λ - rays 10-10 to 10-16

Study Table  and answer the questions.

(b) Which has the second narrowest range?

EASY
AS and A Level
IMPORTANT
Type of electromagnetic waves Wavelength range / m
Radio waves >106 to 10-1
Microwaves 10-1 to 10-3
Infrared

10-3 to 7×10-7

Visible

7×10-7 (red to

4×10-7 (violet)

Ultraviolet 4×10-7 to 10-8
X - rays 10-8 to 10-13
λ - rays 10-10 to 10-16

Study Table  and answer the questions.

(c) What is the range of wavelengths of microwaves, in millimetres?

EASY
AS and A Level
IMPORTANT
Type of electromagnetic waves Wavelength range / m
Radio waves >106 to 10-1
Microwaves 10-1 to 10-3
Infrared

10-3 to 7×10-7

Visible

7×10-7 (red to

4×10-7 (violet)

Ultraviolet 4×10-7 to 10-8
X - rays 10-8 to 10-13
λ - rays 10-10 to 10-16
 

Study Table  and answer the questions.

(d) What is the range of wavelengths of visible light, in nanometres?

EASY
AS and A Level
IMPORTANT
Type of electromagnetic waves Wavelength range / m
Radio waves >106 to 10-1
Microwaves 10-1 to 10-3
Infrared

10-3 to 7×10-7

Visible

7×10-7 (red to

4×10-7 (violet)

Ultraviolet 4×10-7 to 10-8
X - rays 10-8 to 10-13
λ - rays 10-10 to 10-16

 

Study Table  and answer the questions.

(e) What is the frequency range of visible light?