EASY
KCET (UG)
IMPORTANT
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The symbol for photocell is

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Important Questions on Dual Nature of Matter and Radiation

EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 82
The cathode and anode in a photocell are respectively
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 83
Photoelectric cell is NOT used in
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 84

In burglar alarm, infrared beam of light is used instead of visible light because,

EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 85
Select the WRONG statement. Photocells are used in
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 87
Radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c= Velocity of light)
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 88
A 500 W bulb is placed at the centre of a perfectly black sphere of radius R=1 m. The approximate pressure experienced by the walls of the sphere as it absorbs all the photons emitted by the bulb is (take 4π=12.6)
EASY
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 89
A laser beam (λ =633 nm) has a power of 3 mW. What will be the pressure exerted on a surface by this beam if the cross-sectional area is 3 mm2. (Assume perfect reflection and normal incidence)
HARD
KCET (UG)
IMPORTANT
Physics Crash Course KCET (UG)>Chapter 32 - Dual Nature of Matter and Radiation>Exercise 1>Q 90
The pressure exerted by an electromagnetic wave of intensity 1 W m-2 on a non-reflecting surface is :-