NEET Physics: Questions 1364 - 1366 of 2098

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Question number: 1364

» Atoms and Nuclei » Hydrogen Spectrum

Assertion-Reason▾

Assertion (Ꭺ)

Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason (Ꭱ)

Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 1365

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

The Young’s double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

(1) The intensities of individual sources are 5 and 4 units respectively

(2) The intensities of individual sources are 4 and 1 units respectively

(3) The ratio of the their amplitudes is 3

(4) The ratio of their amplitude is 2

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

Codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 1366

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A black body is at a temperature of 2550 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3. The Wein’s constant b = 2.88 × 10 6 nm K. Then

Choices

Choice (4) Response

a.

U2>U1

b.

U1=0

c.

U1>U2

d.

U3=0

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