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频道帖子
| 2 |  没有文字... | 99 |
| 3 |  没有文字... | 113 |
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| 5 |  没有文字... | 105 |
| 6 |  没有文字... | 94 |
| 7 |  没有文字... | 93 |
| 8 |  没有文字... | 102 |
| 9 | https://youtu.be/f4bPCapr640?si=u-FFaqDmqVSdLueA | 112 |
| 10 | COMPREHENSION.pdf | 119 |
| 11 |  没有文字... | 117 |
| 12 |  +1没有文字... | 114 |
| 13 |  没有文字... | 107 |
| 14 |  +1没有文字... | 94 |
| 15 |  没有文字... | 108 |
| 16 | Noun 1 BY Aryan verma sir.pdf | 201 |
| 17 |  没有文字... | 240 |
| 18 | SET - 7. Q .(31 - 35)
In classical physics, light was treated strictly as a wave, but
certain phenomena remained inexplicable until the early 20th
century. One such mystery was the photoelectric effect, which
occurs when light shines on a metallic surface and causes the
emission of electrons. Scientists noticed that regardless of how
bright a light was, it could not eject electrons unless it reached a
specific "threshold frequency." This observation contradicted the
wave theory, which suggested that increasing the light's intensity
should eventually provide enough energy to dislodge the
particles.
The solution came with the proposal that light behaves like a
stream of discrete packets of energy called "photons." Each
photon carries a specific amount of energy determined by its
frequency. When a photon strikes an atom in the metal, it
transfers its energy to an electron. If the photon’s energy is high
enough to overcome the "work function"—the binding energy
holding the electron to the metal—the electron is ejected. This
discovery was revolutionary because it established the
particle-like nature of light. Today, this principle is the
mechanical basis for solar panels, where sunlight is converted
directly into electrical current, and for digital cameras, which use
light sensors to capture images.
Q.31. Identify the correct verb form to complete the sentence
based on the passage.
Each photon ___ a specific amount of energy determined by
its frequency.
(a) possesses (b) possessed (c) possessing (d) will possess
Q.32. Identify the type of sentence.
"Stop the experiment once the threshold frequency is reached!"
(a) Declarative (b) Interrogative (c) Imperative (d) Exclamatory
Q.33. The word “inexplicable” in the passage most nearly means
__.
(a) easy to understand (b) mysterious or unexplainable
(c) very expensive (d) visible to the naked eye
Q.34. In the passage, the antonym of “discrete” is __.
(a) separate (b) continuous (c) tiny (d) hidden
Q.35. According to the passage, why does a very bright light
sometimes fail to eject electrons?
(a) Because the light is too heavy for the metal to absorb.
(b) Because the light's frequency is below the necessary
threshold.
(c) Because the metal reflects the light before it can reach the
atoms.
(d) Because the light packets are moving too slowly to hit the
electrons. | 263 |
| 19 |  没有文字... | 228 |
| 20 | 没有文字... | 310 |
