Question

Question 2.45 Arrange the following type of radiations in increasing order of frequency:

(a) radiation from microwave oven

(b) amber light from traffic signal

(c) radiation from FM radio

(d) cosmic rays from outer space and

(e) X-rays.

Class XI Structure of Atom Page 67

Answer 1

we know ,
increasing order of wavelength of radiation :
cosmic rays < γ rays < X rays < UV rays < visible rays < infrared rays < micro waves < radio waves

but we also know,
frequency = speed of light ( constant )/wavelength

so, increasing order of frequency of radiation just opposite of wavelength ,
e.g., radio waves < micro waves < infrared rays < visible rays < UV rays < X rays < γ rays < cosmic rays

Now, come to the question ,
The order of frequency is radiation from FM radio < micro wave < Amber colour ( visible rays ) < X rays < cosmic rays.

Answer 2

Answer:

Cosmic Rays>X-rays >amber color radiation >microwave radiation> radiation from FM RADIO...

Explanation:

IT IS a verified official NCERT ans so this one is only correct...