# In $$_{35}^{80}Br$$, the number of protons, neutrons, and electrons are-${}_{}{}^{}$ 1. 25, 45, 45 2. 35, 45, 35 3. 45, 45, 35 4. 80, 35, 35

Subtopic:  Number of Electron, Proton & Neutron |
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The number of electrons, protons and neutrons in a species are equal to 18, 16 and 16 respectively. The proper symbol of the species is-

1. $$_{16}^{32}S^{2-}$$

2. $$_{18}^{32}S^{2-}$$

3. ${}_{8}{}^{16}\mathrm{S}$

4. ${}_{16}{}^{32}\mathrm{S}$

Subtopic:  Number of Electron, Proton & Neutron |
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The Vividh Bharati station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter and the part of the electromagnetic spectrum does it belong are-

1. 319.3, Microwave

3. 219.3, Ultraviolet Wave

Subtopic:  Planck's Theory |
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A yellow radiation having wavelength 5800 Å. The wavenumber (a) and frequency (b) of yellow radiation are respectively-

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The frequency of one photons is 5 ×1014 Hz. The energy of one mole of photons of radiation is-

1. 177.51 kJ mol–1

2. 188.51 kJ mol–1

3. 199.51 kJ mol–1

4. 291.61 kJ mol–1

Subtopic:  Planck's Theory |
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A 100-watt bulb emits monochromatic light of wavelength 400 nm. The number of photons emitted per second by the bulb is-

1. 4

2.

3.

4. 2

Subtopic:  Photo Electric Effect |
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When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68 ×105 J mol–1. The minimum energy needed to remove an electron from sodium and the maximum wavelength that will cause a photoelectron to be emitted are respectively-

1. 2.31 × 105 J mol–1, 517 nm

2. 23.1 × 105 J mol–1, 517 nm

3. 3.31 × 105 J mol–1, 417 nm

4. 33.1 × 105 J mol–1, 417 nm

Subtopic:  Photo Electric Effect |
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The threshold frequency νo for a metal is 7.0 ×1014 s–1. The kinetic energy of an electron emitted when radiation of frequency ν =1.0 ×1015 s–1 hits the metal, is-

1. 19.88 ×10–19 J

2. 1.988 ×10–19 J

3. 1.988 ×10–20 J

4. 19.88 ×10–17 J

Subtopic:  Photo Electric Effect |
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The frequency and wavelength of a photon emitted during a transition from n = 5 state to the n = 2 state in the hydrogen atom  are respectively-

1.  $$6.91\times10 ^{14} Hz$$;   543 nm

2. $$7.91\times10 ^{14} Hz$$; 434 nm

3. $$6.91\times10 ^{14} Hz$$; 434

4. $$7.91\times10 ^{14} Hz$$; 343 nm

Subtopic:  Hydrogen Spectra |
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The energy and the radius of the first orbit of He+ are respectively-

1. $$-8.72\times 10^{-18}J$$; 0.02645 nm

2. $$8.72\times 10^{-18}J$$; 0.02645 nm

3. $$-7.82\times 10^{-18}J$$ ; 0.03655 nm

4. $$7.82\times 10^{-18}J$$; 0.03655 nm

Subtopic:  Hydrogen Spectra |
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