Dual Nature of Matter and Radiation (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 39

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Question number: 1

» Dual Nature of Matter and Radiation » Hertz and Lenard's Observations

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

Unit of Rydberg constant R is m-l

Reason (Ꭱ)

It follows from Bohr’s formula v = R [

-

] the symbols have their usual meaning.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 2

» Dual Nature of Matter and Radiation » De-Broglie Relation

Edit
MCQ▾

Question

One electron & one proton is accelerated by equal potential. Ratio of their de-Broglie wavelengths is-

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 3

» Dual Nature of Matter and Radiation » De-Broglie Relation

Edit
MCQ▾

Question

A photon and an electron have equal energy E. is proportional to

Choices

Choice (4) Response

a.

b.

Not depend upon E

c.

d.

Question number: 4

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

Edit
MCQ▾

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: 5

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

Edit
MCQ▾

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 -19 m/s

b.

19.8 × 10 -19 m/s

c.

1.73 × 10 6 m/s

d.

All of the above

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