Which of the following statements about cathode rays is incorrect?
A. They travel in straight lines.
B. Their nature depends on the gas used in the discharge tube.
C. They are deflected by magnetic and electric fields.
D. They are made up of electrons.
Answer: Option B
Solution (By JKSSB Mock Tests)
Cathode rays consist of electrons, which are fundamental particles. Therefore, their nature (charge to mass ratio) is independent of the gas used in the cathode ray tube or the material of the cathode. All other statements are correct properties of cathode rays, demonstrating their fundamental particle nature.
Explanation:
The element with atomic number 118 is Oganesson (Og). It is a synthetic element and a member of the noble gas group (Group 18). Ununennium is the temporary name for element 119, Tennessine is 117, and Nihonium is 113.
Explanation:
Mass number (A) = protons (Z) + neutrons (N). So Z = A - N = 31 - 16 = 15. This is phosphorus (P). Atomic number 15, mass number 31. It has 15 protons and 15 electrons. Number of neutrons = 16. Isotope notation: ³¹₁₅P.
Explanation:
Chadwick (1932) produced highly penetrating neutral radiation by bombarding Be with α-particles, identified as neutrons. Reaction: ⁹Be + ⁴He → ¹²C + ¹n.
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