Question

a friend says, \stars produce energy by a fusion chain reaction of helium into hydrogen.\ evaluate the validity of this statement. a it is an valid statement. stars produce energy by a fusion chain reaction of hydrogen into helium. b it is an invalid statement. stars produce energy by a fusion chain reaction of hydrogen into helium. c it is an invalid statement. stars produce energy by a fission chain reaction of hydrogen into helium. d it is an valid statement. stars produce energy by fission and fusion chain reactions of hydrogen into helium and vice versa

Explanation:

Stars produce energy through nuclear fusion. The process in stars is the fusion of hydrogen into helium, not helium into hydrogen. Fission is a different nuclear process (splitting atoms) and is not the main energy - producing process in stars.

Answer:

B. It is an invalid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.