# AP (Advanced Placement) Physics(B-C): Questions 787 - 791 of 921

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## Question number: 787

### Question

One lens with a focal length of and a second lens with a focal length of are brought into close contact. What is the lens strength, in diopters, of the combination of the two lenses?

### Choices

Choice (5) | Response | |
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a. | 2 | |

b. | 4 | |

c. | 6 | |

d. | 8 | |

e. | None of the above |

## Question number: 788

### Question

Two identical parallel plate capacitors charged with different potential differences. Capacitor stored of energy when charged to potential difference of . How much energy stored by Capacitor 2, when it charged to potential difference of ?

### Choices

Choice (5) | Response | |
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d. |
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e. | All of the above |

## Question number: 789

### Question

A light of wavelength falls on a single slit and produces its first diffraction minimum at an angle of relative to the incident direction of the light. At what angle second minimum produced?

### Choices

Choice (5) | Response | |
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a. |
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b. |
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d. |
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e. | All of the above |

## Question number: 790

» Periodic Motion, Mechanical Waves & Sound

### Question

The equation of displacement of an object of mass , which oscillates with a spring is . What is the spring constant?

### Choices

Choice (5) | Response | |
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b. |
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c. |
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d. |
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e. | All of the above |

## Question number: 791

### Question

At temperature , the black body radiation energy density is nearly:

### Choices

Choice (5) | Response | |
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a. |
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b. |
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c. |
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d. |
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e. | All of the above |