Subjects

• physics,
• j.d. stranathan,
• ions,
• electrons,
• electrical discharge,
• cathode rays,
• mass,
• positive rays,
• isotopes,
• photoelectric effect,
• radiation,
• x-rays,
• xray,
• radioactivity,
• positron,
• neutron,
• atomic nuclei,
• cosmic rays,
• mesotron,
• waves