Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 66

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Weekly Quiz Competition

Question 1
4 / -1

From the figure describing photoelectric effect we may infer correctly that

A
Na and Al both have the same threshold frequency

B
Maximum kinetic energy for both the metals depend linearly on the frequency

C
The stopping potentials are different for Na and Al for the same change in frequency

D
Al is a better photo sensitive material than Na
Question 2
4 / -1

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

A

B

C

D
Question 3
4 / -1

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

A
Curves (a) and (b) represent incident radiations of different frequencies and different intensities

B
Curves (a) and (b) represent incident radiations of same frequency but of different intensities

C
Curves (b) and (c) represent incident radiations of different frequencies and different intensities

D
Curves (b) and (c) represent incident radiations of same frequency having same intensity
Question 4
4 / -1

The graph between 1 / λ and stopping potential (V) of three metals having work functions ϕ₁, ϕ₂ and ϕ₃ in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct? [Here λ is the wavelength of the incident ray]

A
Ratio of work functions ϕ₁ : ϕ₂ : ϕ₃ = 1 : 2 : 4

B
Ratio of work functions ϕ₁ : ϕ₂ : ϕ₃ = 4 : 2 : 1

C
tan θ is directly proportional to he /e, where h is Planck's constant and c is the speed of light

D
The violet colour light can eject photoelectrons from metals 2 and 3

Solution
Question 5
4 / -1

When photon of energy 4.25 eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy T_A eV and de-Broglie wavelength λ_A. The maximum kinetic energy of photoelectrons liberated from another metal B by photon of energy 4.70 eV is T_B = (T_A – 1.50) eV. If the de-Broglie wavelength of these photoelectrons is λ_B = 2λ_A, then

A
The work function of A is 2.25 eV

B
The work function of B is 4.20 eV

C
T_A = 2.00 eV

D
T_B = 2.75 eV

Solution
Question 6
4 / -1

The potential difference applied to a X-ray tube is increased. As a result, in the emitted radiation

A
The intensity wavelength increases

B
The minimum wavelength increases

C
The intensity remains unchanged

D
The minimum wavelength decreases

Solution
Question 7
4 / -1

Photoelectric effect support quantum nature of light because

A
There is a minimum frequency of light below which no photoelectrons are emitted

B
The maximum kinetic energy of photoelectrons depends only on the frequency of light and not on its intensity

C
Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately

D
Electric charge of the photoelectrons is quantized
Question 8
4 / -1

The threshold wavelength, for photoelectric emission, from a material is 5200 Å. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

A
50 watt infrared lamp

B
1 watt infrared lamp

C
50 watt ultraviolet lamp

D
1 watt ultraviolet lamp

Solution
Question 9
4 / -1

The shortest wavelength of X-rays emitted from an X-ray tube depends on

A
The current in the tube

B
The voltage applied to the tube

C
The nature of the gas in the tube

D
The atomic number of the target material

Solution
Question 10
4 / -1

An X-ray tube is operating at 50 kV and 20 mA. The target material of the tube has a mass of 1.0 kg and specific heat 495 J kg^–1° C^–1. One percent of the supplied electric power is converted into X-rays and the entire remaining energy goes into heating the target. Then

A
A suitable target material must have a high melting temperature

B
A suitable target material must have low thermal conductivity

C
The average rate of rise of temperature of target would be 2°C/s

D
The minimum wavelength of the X-rays emitted is about 0.25 × 10^–10 m

Solution