If λ = 10 - 10 m changes to λ ' = 0 . 5 × 10 - 10 m , find energy difference Δ E given to the particle

Δ E is equal to initial energy.

Δ E 1 ' is equal to = 1 4 th of initial energy.

Δ E is equal to 1 2 th of initial energy.

Δ E is equal to twice of initial energy.

E M B I B E

Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 1

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A photocell employs photoelectric effect to convert

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Important Questions on Dual Nature of Matter and Radiation

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 2

The semiconductor

Ge

has a forbidden gap of

1.43 eV

. Calculate maximum wavelength which results from an electron-hole combination:

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 3

An image of the sun is formed by a lens of focal length

30 cm

on the metal surface of a photo-electric cell and it produces a current

I

. The lens forming the image is then replaced by another lens of the same diameter but of focal length

15 cm

. The photoelectric current, in this case, will be (in both cases the plate is kept at the focal plane and normal to the axis of the lens);

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 4

Two identical photo-cathodes receive light of frequencies

f_{1}

and

f_{2} .

If the velocities of the photo electrons (of mass

m

) coming out are respectively

v_{1}

and

v_{2},

then :-

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 5

Monochromatic light of frequency of $6 \times 10^{14} Hz$ is produced by a LASER. The power emitted is $2 \times 10^{- 3} W$ . The number of photons emitted, on the average, by the source per second is

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 7

The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current

I

of the photocell varies as follows:

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 8

The graph is showing the photocurrent with the applied voltage of a photoelectric effect experiment. Then

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 9

If

λ = 10^{- 10} m

changes to

λ^{'} = 0.5 \times 10^{- 10} m

, find energy difference

(Δ E)

given to the particle

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 10

The wavelength involved in the spectrum of deuterium

(_{1}^{2} D)

are slightly different from that of hydrogen spectrum, because

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