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Answer : 3. "जे. ए. फ्लेमिंग "
पहले तापयनिक वाल्व का आविष्कार किया था
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पहले तापयनिक वाल्व का आविष्कार किया था
- 1थॉमस एडिसनfalse
- 2रिचर्डसनfalse
- 3जे. ए. फ्लेमिंगtrue
- 4लीड फॉरेस्टfalse
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Answer : 3. "जे. ए. फ्लेमिंग "
Explanation :
The first thermionic valve, also known as a vacuum tube, was invented by John Ambrose Fleming. Fleming, a British electrical engineer, developed the vacuum tube in 1904. The device, called the Fleming valve or vacuum diode, was a crucial component in early electronics and telecommunications. It played a significant role in the development of radio technology, serving as a rectifier and amplifier. The vacuum tube was an essential invention that paved the way for the advancement of electronic systems and was widely used until the development of semiconductor technology.