Hertz and Lenard's Observations NEET Questions

Physics - Dual Nature of Matter and Radiation

Hertz and Lenard's Observations MCQ Questions


1.
The phenomenon of photoelectric emission was first discovered in:
A.
1887
B.
1897
C.
1905
D.
1879
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ANSWER :
A. 1887
2.
The photoelectric effect was discovered by:
A.
Heinrich Hertz
B.
J.J. Thomson
C.
R.A. Millikan
D.
Albert Einstein
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ANSWER :
A. Heinrich Hertz
3.
Hertz discovered the photoelectric effect during his experimental investigations on:
A.
Conduction of electricity through gases
B.
Production and detection of electromagnetic waves
C.
Measurement of electron charge
D.
Discovery of cathode rays
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ANSWER :
B. Production and detection of electromagnetic waves
4.
In Hertz's original experiment, what did he observe when the emitter plate was illuminated by ultraviolet light?
A.
High voltage sparks across the detector loop were enhanced
B.
The emitter plate became magnetized
C.
The detector emitted X-rays
D.
The spark gap became wider
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ANSWER :
A. High voltage sparks across the detector loop were enhanced
5.
What kind of light was used in Hertz's original photoelectric observation?
A.
Visible green light from a torch
B.
X-rays
C.
Ultraviolet light from an arc lamp
D.
Infrared light
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ANSWER :
C. Ultraviolet light from an arc lamp
6.
In Hertz's experiment, light shining on the metal surface caused:
A.
The light to be reflected as X-rays
B.
The metal to become positively charged in the bulk
C.
The metal to melt
D.
The escape of charged particles (later identified as electrons) from the surface
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ANSWER :
D. The escape of charged particles (later identified as electrons) from the surface