Ultraviolet light is incident on two photosensitive materials hav… - Vidyadip

Question

Ultraviolet light is incident on two photosensitive materials having work functions W₁ and W₂ (W₁ > W₂). In which case will the kinetic energy of the emitted electrons be greater? Why?

✓

Answer

From Einstein’s photoelectric equation $\text{h}\nu=\text{W}+\text{E}_\text{K}$
$\text{E}_\text{K}=\text{h}\nu-\text{W}$
Clearly, smaller the work function, greater is the KE. As W₁ > W₂, KE for metal of work function W₂ will be greater.

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 "Short Answer Type Questions [2M]" from Dual Nature of Radiation and Matter→Dual Nature of Radiation and Matter — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Two point electric charges of unknown magnitude and sign are placed at some distance ‘d’ apart. The electric field intensity is zero at a point, not between the charges but on the line joining them.
Write two essential conditions for this to happen.

Draw the transfer characteristic curve of a base biased transistor in CE configuration. Explain clearly how the active region of the V₀ versus V_i curve in a transistor is used as an amplifier.

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.

The two rails of a railway track, insulated from each other and from the ground, are connected to a millivoltmeter. What will be the reading of the millivoltmeter when a train travels on the track at a speed of 180km/h^-1? The vertical component of earth's magnetic field is 0.2 × 10^-4 T and the rails are separated by 1m.

Write a short note on 'Valves' in electronics.

Light from Balmer series of hydrogen is able to eject photoelectrons from a metal. What can be the maximum work function of the metal?

A $15.0 \mu F$ capacitor is connected to a $220 V , 50 Hz$ source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?

The magnetic field inside a tightly wound, long solenoid is $\text{B}=\mu_0\text{ni}.$ It suggests that the field does not depend on the total length of the solenoid, and hence if we add more loops at the ends of a solenoid the field should not increase. Explain qualitatively why the extra-added loops do not have a considerable effect on the field inside the solenoid.

Write down the Coulomb's law and explain its scalar form.

Answer the following questions: Why must both the objective and the eyepiece of a compound microscope have short focal lengths.