A Level Physics B (Advancing Physics)

The diagram shows a combination of three resistors connected to a 6.0V power supply of

negligible internal resistance.

A voltmeter connected across resistor R reads 3.0 V. What is the resistance of resistor R?

• 
• 100 Ω

• 150 Ω

• 200 Ω

Use the scaled STM image to estimate the diameter of a silver atom.

Explain why the sampling frequency should be at least 25 kHz.

Suggest and explain the number of bits per sample you would use to digitise this waveform.

Three of the nearer galaxies in Fig. 33a have a negative velocity. Suggest and explain the effect this has on the wavelength shift for these galaxies.

Show from the lines of best fit that the best estimate for the Hubble constant H0 was more than eight times (× 8) larger in 1929 than in 1998.

Show that the data from Fig. 33b indicate that the ‘big bang’ happened more than 10 billion years ago.

Show that the number of atoms of 125I atoms initially present in one seed is about 6 × 10^13.

Show that in the first 60 days of irradiation by one implanted seed, the effective dose is about 4 Sv.

Show that in the first 60 days of irradiation by one implanted seed, the effective dose is about 4 Sv.