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Which is true? A photon with frequency f can have any energy. A photon's energy is restricted to a value of hf. A photon's energy can be any integer multiple of hf.

Which is true? A photon with frequency f can have any energy. A photon's energy is restricted to a value of hf. A photon's energy can be any integer multiple of hf.

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Which is true? A photon with frequency f can have any energy. A photon's energy is restricted to a value of h f . A photon's energy can be any integer multiple of h f .

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In the arrangement shown below, an object can be hung from a string (with linear mass density μ = 0.00200 kg/m) that passes over a light pulley. The string is connected to a vibrator (of constant frequency f), and the length of the string between point P and the pulley is L = 1.50 m. When the mass m of the object is either 25.0 kg or 36.0 kg, standing waves are observed; no standing waves are observed with any mass between these values, however. m (a) What is the frequency of the vibrator (in Hz )? (Note: The greater the tension in the string, the smaller the number of nodes in the standing wave.) Hz (b) What is the largest object mass (in kg ) for which standing waves could be observed? kg (c) What If? What would the linear mass density of the string have to be (in kg/m) if 36.0 kg is the largest mass for which standing waves are observed? kg/m (d) For what values of m (in kg) would standing waves with the next four higher numbers of nodes be observed in this case? m2 = kgm3 = kg m4 = kg m5 = kg
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Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.

Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.

Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.
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