Which of the following is true for photon
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(a) E = |
(b) E = |
(c) p = |
(d) E = |
Which of the following is true for photon
|
(a) E = |
(b) E = |
(c) p = |
(d) E = |
(a) E =
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Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function =
where
is the threshold frequency.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
TV waves have a wavelength range of 1-10 meter. Their frequency range in MHz is
| (a) 30-300 | (b) 3-30 | (c) 300-3000 | (d) 3-3000 |
Which of the following is not a correct statement
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(a) Resistivity of electrolytes decreases on increasing temperature |
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(b) Resistance of mercury falls on decreasing its temperature |
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(c) When joined in series a 40 W bulb glows more than a 60 W bulb |
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(d) Resistance of 40 W bulb is less than the resistance of 60 W bulb |
Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
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(a) n = 2 to n = 1 |
(b) n = 4 to n = 3 |
(c) n = 3 to n = 1 |
(d) n = 4 to n = 2 |