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

Question

Electrons in a cathode ray tube have been emitted with a velocity of $1000 {ms}^{- 1}$ . The number of following statements which is/are true about the emitted radiation is

Given : $h = 6 \times 10^{- 34} Js, m_{e} = 9 \times 10^{- 31} kg$

(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..

TestHub · Accepted Answer

(A) V e = 1000 m / s ; h = 6 × 10 - 34 Js m e = 9 × 10 - 31 kg Debroglie wavelength: ⇒ λ = h mv = 6 × 10 - 34 9 × 10 - 31 × 1000 = 666 . 67 × 10 - 9 m = 666 . 67 nm (B) The characteristic of electrons emitted is independent of the material of the electrodes of the cathode ray tube. Electrons are fundamental to all traditional forms of matter. (C) The cathode rays start from cathode and move towards anode. It was discovered by Sir J.J. Thompson. (D) The nature of the emitted electrons is independent on the nature of the gas present in cathode ray tube. They are fundamental particles.

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