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- Question
Choose the most appropriate answer:Natural radioactivity was discovered by
Options- A. Marie Curie
- B. Earnest Rutherford
- C. Henry Bacquerel
- D. Enrico Fermi
- Correct Answer
- Henry Bacquerel
ExplanationNatural radioactivity was discovered by Henri Bacquerel.
- 1. What is the minimum distance (in metres) required to hear an echo?
Options- A. 10
- B. 13
- C. 17
- D. 21 Discuss
- 2. A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]
Options- A. 1568 J
- B. 1568 C
- C. 1568 W
- D. 1568 N Discuss
- 3. In a _________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation
Options- A. longitudinal
- B. rolling
- C. transverse
- D. field Discuss
- 4. Bandwidth is the
Options- A. a measure of the width of a range of frequencies
- B. the rate of data transfer
- C. both a & b
- D. None of the above Discuss
- 5. Kilohertz is a unit which measures
Options- A. Electromagnetic radio wave frequencies
- B. Electric resistance
- C. Power used by a current of one ampere
- D. Voltage Discuss
- 6. 1 kW = ?
Options- A. 1000 W
- B. 10 W
- C. 100 W
- D. 10000 W Discuss
- 7. Negative acceleration is in the opposite direction of:
Options- A. force
- B. distance
- C. velocity
- D. momentum Discuss
- 8. Speed of light is maximum in _____.
Options- A. vacuum
- B. solids
- C. liquids
- D. gases Discuss
- 9. For photoelectric effect to take place, the metal used as the cathode should have_________
Options- A. high melting point
- B. low melting point
- C. Low work function
- D. low resistance Discuss
- 10. A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
Options- A. The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
- B. Both the photons have different energies.
- C. The speeds of both the photons in vacuum are different
- D. The frequency of X-ray photon is higher than the frequency of visible radiation photon. Discuss
Physics problems
Search Results
Correct Answer: 17
Correct Answer: 1568 J
Correct Answer: transverse
Correct Answer: both a & b
Correct Answer: Electromagnetic radio wave frequencies
Correct Answer: 1000 W
Correct Answer: velocity
Correct Answer: vacuum
Correct Answer: Low work function
Correct Answer: The speeds of both the photons in vacuum are different
Explanation:
The speed of all the electromagnetic radiation are always same and equal to the numerical value 3 x 10^8m/sec.
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