Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons as the frequency of incident light increases? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Q. In thin film interference, which of the following will not affect the interference pattern? (2022)
A.
Thickness of the film
B.
Wavelength of light
C.
Angle of incidence
D.
Color of the light source
Solution
While thickness, wavelength, and angle of incidence affect the interference pattern, the color of the light source does not directly affect the pattern itself.
Q. The average speed of gas molecules is given by the formula:
A.
(8kT/πm)^(1/2)
B.
(3kT/m)^(1/2)
C.
(2kT/m)^(1/2)
D.
(kT/m)^(1/2)
Solution
The average speed of gas molecules is given by the formula v_avg = (8kT/πm)^(1/2), where k is the Boltzmann constant, T is the temperature, and m is the mass of a gas molecule.
Q. The average speed of gas molecules is given by which of the following expressions? (2022)
A.
√(8RT/πM)
B.
√(3RT/M)
C.
√(2RT/M)
D.
√(RT/M)
Solution
The average speed of gas molecules is given by the expression v_avg = √(8RT/πM), where R is the universal gas constant, T is the temperature, and M is the molar mass of the gas.
Q. The average speed of gas molecules is given by which of the following formulas? (2023)
A.
(8kT/πm)^(1/2)
B.
(3kT/m)^(1/2)
C.
(2kT/m)^(1/2)
D.
(kT/m)^(1/2)
Solution
The average speed of gas molecules is given by the formula v_avg = sqrt(8kT/πm), where k is the Boltzmann constant, T is the temperature, and m is the mass of a molecule.
Q. The capacitance of a parallel plate capacitor is directly proportional to which of the following? (2019)
A.
Distance between plates
B.
Area of plates
C.
Voltage across plates
D.
Dielectric constant
Solution
Capacitance (C) is directly proportional to the area of the plates (A) and the dielectric constant (ε) and inversely proportional to the distance (d) between the plates.
Q. The capacitance of a parallel plate capacitor is given by which formula? (2020)
A.
C = ε₀A/d
B.
C = Q/V
C.
C = 1/(4πε₀r)
D.
C = V/I
Solution
The capacitance (C) of a parallel plate capacitor is given by the formula C = ε₀A/d, where A is the area of the plates and d is the separation between them.
Q. The electric field between the plates of a parallel plate capacitor is given by which formula? (2020)
A.
E = V/d
B.
E = Q/A
C.
E = CV
D.
E = 1/(4πε₀r²)
Solution
The electric field (E) between the plates of a parallel plate capacitor is given by the formula E = V/d, where V is the voltage and d is the separation between the plates.
Q. The electric field between the plates of a parallel plate capacitor is given by which expression? (2020)
A.
E = V/d
B.
E = d/V
C.
E = CV
D.
E = Q/A
Solution
The electric field (E) between the plates of a parallel plate capacitor is given by the expression E = V/d, where V is the voltage and d is the distance between the plates.