Arrange the following types 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.

  • A
    $(c) < (a) < (b) < (e) < (d)$
  • B
    $(d) < (e) < (b) < (a) < (c)$
  • C
    $(c) < (b) < (a) < (e) < (d)$
  • D
    $(d) < (b) < (a) < (e) < (c)$

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What is the charge on $\gamma$-rays?

The work function $(\phi)$ of some metals is listed below. The number of metals which will show photoelectric effect when light of $300 \ nm$ wavelength falls on the metal is
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$\phi \ (eV)$ $2.4, 2.3, 2.2, 3.7, 4.8, 4.3, 4.7, 6.3, 4.75$

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What is the photoelectric effect? Explain it.

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Chlorophyll present in green leaves of plants absorbs light at $4.620 \times 10^{14} \ Hz$. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?

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