EASY
JEE Main/Advance
IMPORTANT
Earn 100

In Davisson-Germer experiment, the filament emits

50% studentsanswered this correctly

Important Questions on Dual Nature of Matter and Radiation

EASY
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 33
In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by :
HARD
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 35
Energy evolved from the fusion reaction 2 H12 =  2He14 Q is to be used for the production of power. Assuming the efficiency of the process to be 30 %.Find the mass of deuterium that will be consumed in a second for an output of 50 MW.  He41 = 4.002603 amu and H21 = 2.014102 amu. 
MEDIUM
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 1
The photoelectrons emitted from a metal surface :
MEDIUM
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 2
A point source causes photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal?
HARD
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 3
In a photoelectric experiment, with light of wavelength λ, the fastest electron has speed v. If the existing wavelength is changed to 3λ4 the speed of the fastest emitted electron will become
MEDIUM
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 4

In a photoelectric experiment, the frequency and intensity of a light source are both doubled. Then consider the following statements. 

(i) The saturation photocurrent remains almost the same. 

(ii) The maximum kinetic energy of the photoelectrons is doubled. 

HARD
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 5
When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cutoff voltage and the saturation current are respectively 0.6 V and 18 mA. If the same source is placed 0.6 m away from the cell, then : 
MEDIUM
JEE Main/Advance
IMPORTANT
Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 6
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 focal plane and normal to the axis lens). (Assume saturation current only).