NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    What is the cause of "Greenhouse effect"?                                                                           [AIPMT 2002]

    A)        Infrared rays     

    B)       Ultraviolet rays

    C)       X-rays               

    D)       Radio-waves

    Correct Answer: A

    Solution :

    The green house is a room made of glass which is constructed to grow plants in open space. The glass transmits the infrared radiations of short wavelength and the visible light, but it absorbs die infrared radiations of long wavelength. During the day time the light and the infrared radiations of short wavelength enter inside the green house through die roof and the walls and they are absorbed by the plants. At night plants emit the infrared radiations through the glass wall and roof. As a result greenhouse remains warm. This is called greenhouse effect.

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