Infrared radiations are absorbed by the glass but are transmitted by rock salt.

Infrared radiations

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False

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Solution

The correct option is A
Infrared radiations

Infrared radiations are electromagnetic radiations having the wavelength in the range of 800 nm to 1 mm. All red-hot bodies are the sources of Infrared radiations. One of its property is that they are absorbed by the glass but are transmitted by the rock salt. So, the given statement is true.

Suggest Corrections

Similar questions

Give reason for the following :

(i) Infrared radiations are used for photography in fog.

(ii) Infrared radiations are used for signals during the war.

(iii) The photographic darkrooms are provided with the infrared lamps.

(iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

(v) A quartz prism is required for obtaining the spectrum of the ultraviolet light.

(vi) Ultraviolet bulbs have a quartz envelope instead of glass.

Infrared radiations are used for

x \times 10^{19}

6 \times 10^{- 34}

1500 n m

100 W

12 %

(x \times 10^{19})

x

h = 6.625 \times 10^{- 34} J - s

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