Quiz #20 1) A type of energy embodied in oscillating electric and magnetic field

Question

Quiz #20 1) A type of energy embodied in oscillating electric and magnetic fields is called A) infrared radiation. B) microwave radiation. C) magnetism. D) electricity E) electromagnetic radiation. 2) The number of cycles that pass through a stationary point is called A) wavelength. B) amplitude. C) frequency. D) area. E) median. 3) Which of the following colors of electromagnetic radiation has the shortest wavelength? A) blue B) violet C) orange D) green E) yellow 4) A sunburn is caused by overexposure to A) ultraviolet radiation. B) gamma C) microwave D) x-ray E) radio 5) Food can be cooked byradiation. A) ultraviolet B) gamma C) microwave D) x-ray

Explanation / Answer

1.(E) electro magnetic radiation

2.(C) frequency

3. The VIBGYOR colours are

violet , indigo , blue , green , yellow , orange , red

---------------------------------------------------------------------> incresing the wave length

so the shortest wave length colour is violet

Therefore option (B) is correct

4.(A) ultra violet

5. (C) micro waves

6. We know that wave length , = c/v

Where

c = speed of light = 3x 108 m/s

v = frequency = 6.88x1014 Hz

So = (3x 108 )/ (6.88x1014)

= 4.36x10-7 m

= 436 nm

7. Energy , E = hv

Where

h = plank's constant = 6.625x 10-34 Js

v = frequency =5.49x1014 Hz

Plug the values we get E = 3.64x10-19 J

8. We know that wave length , = c/v

Where

c = speed of light = 3x 108 m/s

v = frequency = 101.2 MHz = 101.2x106 Hz

So = (3x 108 )/ (101.2x106)

= 2.964 m

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