Download App

Photoelectric Effect and WaveParticle Duality — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsPhotoelectric Effect and WaveParticle Duality5 Marks
Question
It is found that yellow light does not eject photoelectrons from a metal. Is it advisable to try with orange light? With green light?
✓

Answer

Photoelectrons are emitted from a metal's surface if the frequency of incident radiation is more than the threshold frequency of the given metal surface. As yellow light does not eject photoelectrons from a metal it means that the threshold frequency of the metal is more than the frequency of yellow light. Since the frequency of orange light is less than the frequency of yellow light, therefore it will not be able to eject photoelectrons from the metal's surface. The frequency of green light is more than the frequency of yellow light. Hence, when it is incident on the metal surface, it will eject electrons from the metal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Photoelectric Effect and WaveParticle Duality→Photoelectric Effect and WaveParticle Duality — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The electric field in a region is given by $\overrightarrow{\text{E}}=\frac{\text{E}_0\text{x}}{\text{l}}\vec{\text{i}}.$ Find the charge contained inside a cubical volume bounded by the surfaces x = 0, x = a, y = 0, y = a, z = 0 and z = a. Take E0 = 5 × 103Nc-1, l = 2cm and a = 1cm.
→
A capacitor of capacitance C is connected to a battery of emf $\in$ at t = 0 through a resistance R. Find the maximum rate at which energy is stored in the capacitor. When does the rate have this maximum value?
→
A paisa coin is made up of Al-Mg alloy and weighs 0.75g. It has a square shape and its diagonal measures 17mm. It is electrically neutral and contains equal amounts of positive and negative charges.
Treating the paisa coins made up of only Al, find the magnitude of equal number of positive and negative charges. What conclusion do you draw from this magnitude?
→
Oxygen is filled in a closed metal jar of volume 1.0 × 10-3m3 at a pressure of 1.5 × 105Pa and temperature 400K. The jar has a small leak in it. The atmospheric pressure is 1.0 × 105Pa and the atmospheric temperature is 300K Find the mass of the gas that leaks out by the time the pressure and the temperature inside the jar equalise with the surrounding.
→
What is rivetted galvanometer? What is the function of shunt in a galvanometer?
→
Suppose that the radius of cross-section of the wire used in the previous problem is r. Find the increase in the radius of the loop if the magnetic field is switched off. Young's modulus of the material of the wire is Y.
→
A constant current exists in an inductor-coil connected to a battery. The coil is short-circuited and the battery is removed. Show that the charge flown through the coil after the short-circuiting is the same as that which flows in one time constant before the short-circuiting.
→
A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor?
→
The magnetic field inside a long solenoid having 50 turns/cm is increased from 2·5 × 10.3T to 2.5T when an iron core of cross-sectional area 4cm2 is inserted into it. Find:
  1. The current in the solenoid.
  2. The magnetization I of the core.
  3. The pole strength developed in the core.
→
What is Gauss theorem? With its help, obtain an expression for the electric field intensity at any point near a uniformly charged linear conductor of infinite length.###Make the necessary diagram and with the help of Gauss law, calculate the electric field intensity at any point due to a charged wire of infinite length. Plot the change in intensity with distance.###Define Gauss' law. With its help, find the value of electric field intensity at a distance from a uniformly charged linear conductor of infinite extension. Make the necessary diagram and also make a graph of the change of electric field with distance.
→