Copy and complete Table 12.2. (You may assume that the speed of radio waves is 3 . 00 × 10 8 m s - 1 ) Station Wavelength / m Frequency / M H z Radio A (FM) 97 . 6 Radio B (FM) 94 . 6 Radio B (LW) 1515 Radio C (MW) 693

Given, the speed of radio waves is v = 3 . 00 × 10 8 ms - 1 And we know that the relationship of the speed of sound v , its frequency f , And its wavelength λ Is given by v = fλ , or f = v λ , or λ = v f Station Wavelength / m Frequency / MHz Radio A FM = v f = 3 . 0 × 10 8 97 . 6 × 10 6 = 3 . 07 97 . 6 Radio B FM = v f = 3 . 0 × 10 8 94 . 6 × 10 6 = 3 . 17 94 . 6 Radio B LW 1515 = v λ = 3 . 0 × 10 8 1515 Hz = 0 . 198 Radio C MW 693 = v λ = 3 . 0 × 10 8 693 Hz = 0 . 433

Type of electromagnetic waves Wavelength range / m Radio waves > 10 6 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?

The visible Radiation has the narrowest range of the wavelength.its range of wavelength is 7 × 10 - 7 ( red ) to 4 × 10 - 7 ( violet ) And frequency is 4 . 3 × 10 14 to 7 . 5 × 10 14 . Visible radiation, also referred to as visible light or simply “light,” is a form of electromagnetic radiation characterised by electromagnetic waves with wavelengths.

EASY

AS and A Level

IMPORTANT

Earn 100

Sound is a mechanical wave that can be transmitted through a solid. Calculate the frequency of sound of wavelength $0.25 m$ that travels through steel at a speed of $5060 {ms}^{- 1}$

Important Questions on Waves

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 7

A cello string vibrates with a frequency of

64 Hz

. Calculate the speed of the transverse waves on the cello string given that the wavelength is

140 cm

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 8

An oscillator is used to send a transverse wave along a stretched string. The wavelength of the wave is $5.0 cm$ when the frequency of the oscillator is $30 Hz$ . For this wave, calculate:

(a) Its frequency

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 8

An oscillator is used to send a transverse wave along a stretched string. The wavelength of the wave is $5.0 cm$ when the frequency of the oscillator is $30 Hz$ . For this wave, calculate:

(b) Its speed.

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 9

Copy and complete Table 12.2. (You may assume that the speed of radio waves is $3.00 \times 10^{8} m s^{- 1}$ )

Station	Wavelength / $m$	Frequency / $M H z$
Radio A (FM)		$97.6$
Radio B (FM)		$94.6$
Radio B (LW)	$1515$
Radio C (MW)	$693$

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Question>Q 10

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

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

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Question>Q 10

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

(b) Its observed frequency. (Speed of sound in air $= 330 m s^{- 1}$ .)

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 11

Question Image

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

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 12

Type of electromagnetic waves	Wavelength range / $m$
Radio waves	$> 10^{6} to 10^{- 1}$
Microwaves	$10^{- 1} to 10^{- 3}$
Infrared	$10^{- 3} to 7 \times 10^{- 7}$
Visible	$7 \times 10^{- 7}$ (red to $4 \times 10^{- 7}$ (violet)
Ultraviolet	$4 \times 10^{- 7} to 10^{- 8}$
$X$ - 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?

Sound is a mechanical wave that can be transmitted through a solid. Calculate the frequency of sound of wavelength 0.25 m that travels through steel at a speed of 5060 ms-1

Important Questions on Waves

Learn and Prepare for any exam you want !

Sound is a mechanical wave that can be transmitted through a solid. Calculate the frequency of sound of wavelength $0.25 m$ that travels through steel at a speed of $5060 {ms}^{- 1}$