Question 4646:

Radioactive elements are ____________

A. Chemically reactive elements
B. Noble elements
C. Rare earth elements
D. Elements that spontaneously emit radiation

Question 4647:

The following radiations are electrically neutral except

A. A-rays
B. \(Y\)-rays
C. X-rays
D. Neutrons

Question 4648:

Upon which one of the following parameters does the energy of a photon depend?

A. Mass
B. Polarization
C. Amplitude
D. Frequency

Question 4649:

Which of the following is NOT true about cathode ray?

A. It moves in a straight line
B. It causes fluorescence
C. It possesses a negative charge
D. It can produce -particles

Question 4650:

Who proposed the planetary model of the nucleus?

A. J. J Thomson
B. Albert Einstein
C. Ernest Rutherford
D. Marie Curie