On increasing the temperature the work f...

On increasing the temperature the work function of metal will

Increase

Decrease

Remains same

First increase and then decrease

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Define work function of a metal.

Increase in temperature

STATEMENT-1 : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased. and STATEMENT-2 : On increasing the temperature of the wire , conductivity of metallic wire decreases.

The work function of a metal is 3.4 eV. If the frequency of incident radiation is increased to twice, then the work function of the metal becomes.

Assertion: The value of ionic product of water (K_w) increases on increasing the temperature. Reason: The ionisation of water increases with an increase in temperature.

Two photons of energies twice and thrice the work function of a metal are incident on the metal surface .Then, the ratio of maximum velocities of the photoelectrons emitted in the two cases respectively ,is

In a black body radiation at certain temperature T_1 the wave length having maximum intensity of radiation equals 9000A^@ . When the temperature is increased from T_1 "to" T_2 the total radiation increases 16 times. The peak radiation at T_2 is found to be capable of ejecting photoelectrons. The maximum kinetic energy of photoelectrons is the same as the energy of photon that one gets when one of electron in the M -shall of hydrogen atom jumps to L-shell the work function of the metal will be

Assertion : The angle of contact of a lilquid with a solid decreases with increase in temperature. Reason : With increase in temperature, the surface tension of the liquid increases.

How does an increase in the temperature affect the specific resistance of a : Metal and

The peak emission from a black body at a certain temprature occurs at a wavelength of 9000 Å . On increase its temperature , the total radiation emmited is increased its 81 times. At the intial temperature when the peak radiation from the black body is incident on a metal surface , it does not cause any photoemission from the surface . After the increase of temperature, the peak from the black body caused photoemission. To bring these photoelectrons to rest , a potential equivalent to the excitation energy between n = 2 and n = 3 bohr levels of hydrogen atoms is required. Find the work function of the metal.

AAKASH INSTITUTE ENGLISH-Mock Test 38: PHYSICS-Example

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