Hertz and Lenard's Observations NEET Questions

Physics - Dual Nature of Matter and Radiation

Hertz and Lenard's Observations MCQ Questions


7.
Hertz's discovery of photoelectric emission was a:
A.
Confirmation of Einstein's quantum theory
B.
Planned experiment to find quantum effects
C.
Result of investigating black-body radiation
D.
Side observation during his electromagnetic wave experiments
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ANSWER :
D. Side observation during his electromagnetic wave experiments
8.
Wilhelm Hallwachs studied the photoelectric effect by connecting a charged plate to:
A.
An electroscope
B.
A galvanometer
C.
A voltmeter
D.
An ammeter
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ANSWER :
A. An electroscope
9.
What did Hallwachs observe when a negatively charged zinc plate was illuminated by ultraviolet light?
A.
The zinc plate gained more negative charge
B.
The zinc plate emitted positive ions
C.
The zinc plate became magnetic
D.
The zinc plate lost its charge
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ANSWER :
D. The zinc plate lost its charge
10.
Hallwachs observed that an uncharged zinc plate, when irradiated by ultraviolet light, became:
A.
Negatively charged
B.
Positively charged
C.
Heated only, with no charge change
D.
Magnetized
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ANSWER :
B. Positively charged
11.
Hallwachs found that a positively charged zinc plate, when illuminated by UV light:
A.
Lost its positive charge and became negative
B.
Showed an enhancement of its positive charge
C.
Did not change its charge
D.
Became magnetized
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ANSWER :
B. Showed an enhancement of its positive charge
12.
From his observations on the zinc plate, Hallwachs concluded that:
A.
Positively charged particles were emitted under UV light
B.
Negatively charged particles were emitted from the zinc plate under UV light
C.
The plate's mass decreased significantly
D.
UV light was itself negatively charged
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ANSWER :
B. Negatively charged particles were emitted from the zinc plate under UV light