MCQ
Photoelectric effect can be caused by
- Avisible light but not $X-$ rays
- BGamma rays but not by $X-$ rays
- C$U.V.$ light only
- ✓Visible light, $U.V.$ rays and Gamma rays also
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$(I) \,C_6H_5CH_3$
$(II)\, C_6H_5COOH$
$(III)\, C_6H_6$
$(IV) \,C_6H_5NO_2$