# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1172 - 1175 of 2320

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## Question number: 1172

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

### Question

The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those X-rays which can be diffracted by this crystal is-

(1) 5 Å (2) 10 Å

(3) 20 Å (4) 25 Å

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) | Response | |
---|---|---|

a. | 1 and 2 are correct | |

b. | 2 and 4 are correct | |

c. | 1 and 3 are correct | |

d. | 1,2 and 3 are correct |

## Question number: 1173

» Properties of Solids & Liquids » Heat Transfer » Radiation

### Question

An ice box used for keeping eatable cold has a total wall, area of 1 meter ^{2} and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is *K =* 0.01 joule/meter °C is filled with ice at 0° C along with eatables on a day when the temperature is 30°C. The latent heat of fusion of ice is 334 × 10 ^{3} joules/kg. The amount of ice melted in one day is (1 day = 86,400 seconds)

### Choices

Choice (4) | Response | |
---|---|---|

a. | 11520 gm | |

b. | 7760 gm | |

c. | 1552 gm | |

d. | 776 gm |

## Question number: 1174

### Question

The equation of two light waves are , . The ratio of maximum to minimum intensities produced by the superposition of these waves will be

### Choices

Choice (4) | Response | |
---|---|---|

a. | 1: 49 | |

b. | 49: 1 | |

c. | 7: 1 | |

d. | 1: 7 |

## Question number: 1175

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

### Question

An electromagnetic radiation of frequency 3 × 10 ^{15} cycles per second falls on a photo electric surface whose work function is 4.0 eV Find out the maximum velocity of the photo electrons emitted by the surface-

### Choices

Choice (4) | Response | |
---|---|---|

a. | 13.4 × 10 | |

b. | 19.8 × 10 | |

c. | 1.73 × 10 | |

d. | All of the above |