Electrons in a cathode ray tube have been emitted with a velocity of 1000 m s–1. The number of following statements which is/are true about the emitted radiation is_____________. Given: h = 6 × 10–34

Question

Electrons in a cathode ray tube have been emitted with a velocity of 1000 m s–1. The number of following statements which is/are true about the emitted radiation is_____________. Given: h = 6 × 10–34 J s, me = 9 × 10–31 kg.

(A) The deBroglie wavelength of the electron emitted is 666.67 nm.
(B) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.
(C) The cathode rays start from cathode and move towards anode.
(D) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube.

Prashant Kotian · Accepted Answer

Correct answer: B. Given mass of e– = 9 × 10–31 kg h = 6 × 10–34 J/sec wavelength () = 31 e e 10 10 v m h       = m 3 6   = 0.66667 × 10–6 m = 666.67 × 10–9 m = 666.67 nm Cathode rays does not depends on nature of gas and metal plate. | JEE(Main) 2023 | DATE : 01-02-2023 (SHIFT-1) | PAPER-1 | OFFICIAL PAPER | CHEMISTRY PAGE # 12

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