Which among the following is not true for photoelectric effect ?

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Which among the following is not true for photoelectric effect ?

1. Thershold frequency is needed to cause photoelectric effect2. There is no time lag between striking of light and ejection of electron3. Number of photoelectrons is independent of intensity4. Kinetic energy of ejected electrons (photoelectrons) depend on frequency of light used

Which among the following is not true for photoelectric effect ?