In an electrical heat equivalent experiment, 2000J of electrical energy is used

Question

In an electrical heat equivalent experiment, 2000J of electrical energy is used to heat 150 g of water in a calorimeter cup. Further assume that all electrical energy is converted into heat. What is the change in of the water? A) 4.186 degree C B) 1.6 degree C) 12.3 degree C D) 3.2 degree C Assume the measured time constant for another RC circuit is 40s. The voltage on the power supply is set to 15 V The equation of the best fit line to an exponential fit of the voltage vs. time data for the discharging capacitor should be: A)y= 10.0 e^-0.0025 x B)y= 15.0 c^-40x C)y = 10.0 e^-0025x D)y = 15.0 e^-0 025x Based on Bohr's model for the hydrogen atom, the longest wavelength emitted for the Balmer series has the following value: A) 650 times 10^-9 nm B) 400 times 10^-7m C)656 times 10^-9m D)700 times 10^-9nm If you triple the frequency of the tuning fork, which of the following statements is true. 5 A) The observed resonance positions will have a smaller value. B) The observed resonance positions will have a larger value. C) There is no change in the observed resonance positions. B) The resonance positions will only change if the temperature in the resonance tube changes. 12. In an electrical circuit power output at a resistor is 100 Watt. If the voltage is halved in the circuit what will be the new power output ? A) 200 w B) 25 W C) 400 W D) 50 W. 10. 11.

Explanation / Answer

8.

Electrical energy = heat energy

2000 = m c DT

DT = (2000)/(150 * 4.186)

DT = 3.2 deg , option D

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9.

use the equation V = Vo (e^-t/RC) while discharging

Y = 15 * e^(-40 T)

option B

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10 .

formula for Balmer series for wavelength (L)

1/L = R*(1/2^2 - 1/n^2)

where n = 3, 4,5, .............

1/L = 1.097 *10^7 *(1/4 -1/infinity)

L = 400 nm

option B

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11.
since Velocity V = 2 n * (l2-l1)

n * dL = constant

so as n( frequncey increases, dl also increases)

so

option B it is

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12.

Power P = V^2/R

so if V' = V/2

then

P2/P1 = V2^2/V1^2

P2/P1 = 1/4

P2 = 100/4 = 25 W

option B it is

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