物理光的波動性 DSE、CE 選擇題（第 2 頁）

11.

Which of the following is an application of ultra-violet radiation ?

12.

Part of the electromagnetic spectrum: X-rays, P, visible light, Q, microwaves

Part of the electromagnetic spectrum is shown above. Which of the following statements is/are correct ?

(1)

P

is ultra-violet and

Q

is infra-red.

(2)The wavelength of

P

is shorter than that of

Q

.

(3)The speed of

P

in vacuum is higher than that of

Q

.

13.

Which of the following is **not** an application of the corresponding electromagnetic wave ?

	Electromagnetic wave	Application
	Ultra-violet	Camera autofocusing
	Infra-red	Detecting survivors buried in landslides
	Microwaves	Satellite communication
	X-rays	Detecting weapons hidden in suitcases

14.

Arrange the following electromagnetic waves in ascending order of frequencies.

(1)X-rays

(2)Ultra-violet rays

(3)Radio waves

15.

Which of the following statements concerning infra-red radiation is correct ?

16.

A radio station broadcasts at a frequency of $94$ MHz. Find the wavelength of the radio waves.

17.

Which of the following statements is/are true ?

(1)Light is a transverse wave.

(2)Light does not undergo diffraction.

(3)Light transmits energy.

18.

Given that the wavelengths of visible light range from $4\times10^{-7}$ m to $7\times10^{-7}$ m, which of the following combinations of wavelengths for infrared, red and violet lights is possible ?

Infrared	Red light	Violet light
$1\times10^{-4}$ m	$7\times10^{-7}$ m	$4\times10^{-7}$ m
$1\times10^{-7}$ m	$7\times10^{-7}$ m	$4\times10^{-7}$ m
$1\times10^{-4}$ m	$4\times10^{-7}$ m	$7\times10^{-7}$ m
$1\times10^{-7}$ m	$4\times10^{-7}$ m	$7\times10^{-7}$ m

19.

Which of the following is an application of microwaves in everyday life ?

20.

Which of the following graphs correctly shows the variation of speed $v$ against frequency $f$ of the electromagnetic waves in vacuum ?

Four graphs A to D of speed v against frequency f: A straight line through origin, B curve levelling off, C curve rising, D horizontal line